M

Mantra

AI-powered manga translation engine for publishers

Overview

Mantra builds AI-powered translation tools for manga and distributes them to publishers and manga platforms. Its main product, the Mantra Engine, processes manga content to produce translations that preserve the original artwork, layout, and narrative context, delivering accurate, culturally appropriate localization. The service is offered on a subscription basis to B2B customers such as publishers and platforms, with additional revenue opportunities from licensing and partnerships. This approach aims to cut the time and cost of traditional translation, making manga more accessible to a global audience while maintaining quality. Mantra differentiates itself by specializing in manga translation, leveraging AI and ML to handle the unique combination of text and artwork, and by actively engaging with industry programs and awards to validate its impact.

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About Mantra

Simplify's Rating
Why Mantra is rated
B-
Rated B on Competitive Edge
Rated B on Growth Potential
Rated C on Differentiation

Industries

Data & AnalyticsEnterprise SoftwareAI & Machine Learning

Company Size

51-200

Company Stage

Early VC

Total Funding

$7.9M

Headquarters

Tokyo, Japan

Founded

2020

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What believers are saying

  • 2026-06-26 Mantra raised ¥780 million from Shueisha, Shogakukan, KADOKAWA, and Square Enix HD.
  • Japan's Agency of Cultural Affairs-backed anti-piracy push favors faster licensed translations.
  • NEDO lists a 2025-2026 grant and adoption targets with two distribution services.

What critics are saying

  • Mantra depends on a few publishers; Square Enix and BOOKWALKER concentration is dangerous.
  • Human review still handles dialogue, sound effects, and browser-only delivery, limiting automation depth.
  • Any translation error damages trust quickly; publishers can replace Mantra with in-house workflows.

What makes Mantra unique

  • 2026-05-15 BOOKWALKER launched Mantra-powered cross-border doujinshi translation.
  • Square Enix phased in Mantra typesetting automation after 1,516-page beta testing.
  • Mantra supports 18 languages and manga-specific speech-bubble recognition.

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Funding

Total Funding

$7.9M

Above

Industry Average

Funded Over

4 Rounds

Early VC funding comparison data is currently unavailable. We're working to provide this information soon!
Early VC Funding Comparison Coming Soon

Benefits

  • Hybrid Work Options

Company News

Mantra
Aug 6th, 2026
Mantra's Ryosuke Furuta won the Excellence Award and Audience Award at the 29th Meeting on Image Recognition and Understanding (MIRU2026)!

Mantra's Ryosuke Furuta won the Excellence Award and Audience Award at the 29th Meeting on Image Recognition and Understanding (MIRU2026)! At the 29th Meeting on Image Recognition and Understanding (MIRU2026), held at Dejima Messe Nagasaki from August 3 to August 6, 2026, Mantra's Ryosuke Furuta received both the MIRU Excellence Award and the MIRU Audience Award! (C) Kato Masaki (C) Yabuno Tenya, Watanabe Tatsuya MIRU Excellence Award OS1C-06: Inference-time Flow Trajectory Optimization for Manga Image Editing Ryosuke Furuta (Mantra, The University of Tokyo) Reason for Award: Proposed a clever and straightforward technique to adapt a Rectified Flow model pre-trained on natural images for manga image editing across domains without re-training. The problem formulation thoughtfully accounts for copyright concerns unique to manga, and the concept of enabling training-free, out-of-domain image editing was highly recognized for its significant industrial and academic value, with promising applicability to non-manga domains. MIRU Audience Award OS1C-06: Inference-time Flow Trajectory Optimization for Manga Image Editing Ryosuke Furuta (Mantra, The University of Tokyo) About the Meeting on Image Recognition and Understanding (MIRU) The Meeting on Image Recognition and Understanding (MIRU) is Japan's largest academic conference dedicated to image recognition and understanding technologies. It serves as a forum where researchers, engineers, and students from various companies and universities gather to discuss, network, and present the latest research spanning from fundamentals to practical applications. * Paper Title: Inference-time Trajectory Optimization for Structure-Preserving Manga Image Editing * Paper: https://arxiv.org/abs/2603.27790 * Code: https://github.com/mantra-inc/structure-preserving-manga-editing

Mantra
May 15th, 2026
Japan and Taiwan BOOK | WALKER to fully launch cross-border sales of doujinshi on May 15.

Japan and Taiwan BOOK | WALKER to fully launch cross-border sales of doujinshi on May 15. Providing a new reading experience beyond language barriers through Mantra's automatic manga translation. Dwango Co., Ltd. and Taiwan Man Du Co., Ltd. will fully launch cross-border sales of manga doujinshi viewable through a viewer equipped with automatic translation on Friday, May 15, 2026, on the comprehensive e-book stores "BOOK | WALKER" and "Taiwan BOOK | WALKER," operated by the respective companies, in cooperation with Mantra Inc. (C) 頸椎 (C) 三月館 BOOK | WALKER is a comprehensive e-book store operated by the KADOKAWA Group that launched in 2010. In addition to books published by commercial publishers, BOOK | WALKER began offering doujinshi created by individuals and circles in 2015. Today, it provides services across both sales and production, including the sale of more than 10,000 doujinshi titles and the provision of an electronic comic creation tool. Meanwhile, Taiwan BOOK | WALKER, which launched in 2016, began expanding its handling of doujinshi in earnest in 2024 in response to the growing popularity of doujinshi in Taiwan in recent years. At doujinshi events in Japan, the number of overseas fans attending has been increasing year by year, driving greater demand for multilingual doujinshi. At the same time, individual creators face various hurdles when expanding overseas, including the high cost of translation. To overcome this language barrier, Mantra, which develops and provides an automatic translation system dedicated to manga, has partnered with BOOK | WALKER in Japan and Taiwan. Since spring 2025, the companies have been trialing a pioneering cross-border sales initiative in which Japanese-language manga doujinshi are sold on Taiwan BOOK | WALKER, while Traditional Chinese manga doujinshi are sold on Japan's BOOK | WALKER. Purchased doujinshi can be read through a viewer with automatic translation, which displays natural translations that take context into account directly on the reading screen. The number of eligible titles has now been expanded to approximately 340, and the lineup will continue to grow in stages. A campaign will also be held to commemorate the official launch. In the highly passion-driven field of doujinshi, creating opportunities for works and readers to connect across countries and languages is a role that Dwango's e-book business - whose vision is to "create a world where 'loves' connect" - believes it should fulfill. Starting with this initiative for manga doujinshi, the companies aim to further expand the scope of eligible works and supported languages, providing an environment where readers can enjoy books seamlessly. Feature overview how to read with translations displayed. After purchasing an eligible doujinshi title, readers can tap or mouse over speech bubbles on the reading screen to display and read the translation at the bottom of the page. * Translation is supported only for dialogue inside speech bubbles. Sound effects and other text outside speech bubbles cannot be translated. * Translations are available only via web browser, and are not supported in the app or for preview reading. Japanese translation displayed for a Traditional Chinese doujinshi / (C) 頸椎 Chinese translation displayed for a Japanese doujinshi / (C) 三月館 Eligible titles. Creators can register, submit for review, and sell their manga works as usual through the BOOK | WALKER Author Center in Japan or Taiwan. If a work becomes eligible for cross-border sales using automatic translation, the relevant service will contact the creator before the sales begin. No additional application is required. BOOK | WALKER Author Center. Translation quality. This feature uses a machine translation engine developed by Mantra Inc. specifically for manga. Equipped with manga-specific text recognition and character identification technologies, the engine achieves high-quality manga translation by enabling an advanced understanding of story context and relationships between characters. Launch commemorative campaign. BOOK | WALKER. Campaign details: +20% coin back on eligible titles Campaign period: Friday, May 15, 2026 - Sunday, May 31, 2026 Special websites: Taiwan BOOK | WALKER Doujin Works Campaign: https://bookwalker.jp/select/4407/ Taiwan BOOK | WALKER BL Doujin Works Campaign: https://bookwalker.jp/select/4408/ Taiwan BOOK | WALKER. Campaign details: 15% off one title, 21% off three titles, 31% off five titles Campaign period: Friday, May 15, 2026 - Sunday, May 31, 2026 Service overview. BOOK | WALKER is a comprehensive e-book store operated by Dwango Co., Ltd. that will celebrate its 15th anniversary in December 2025. It offers one of Japan's largest selections of e-books, with more than 2 million titles from over 1,500 publishers, spanning a wide range of genres including manga, light novels, novels, business books, and practical guides. In addition to individual title purchases, BOOK | WALKER offers uniquely digital reading experiences such as "BOOK | WALKER Unlimited," a subscription service for enjoying manga, manga magazines, Kadokawa Bunko titles, light novels, and more, as well as "Maruyomi 10 Minutes," which allows users to preview all pages of eligible titles for 10 minutes per person per day. Taiwan BOOK | WALKER is an e-book store operated by Taiwan Man Du Co., Ltd. that launched in 2016. As a pioneer in Taiwan's e-book market, it offers a wide range of e-books, including Traditional Chinese editions of Japanese manga and light novels, works from local Taiwanese publishers, and doujinshi. Mantra Inc. Mantra Inc. was founded in 2020 under the slogan "Bringing manga to the world, in every language." The company conducts research and development in AI technologies specialized for manga, and provides services including "Mantra Engine," a translation tool that enables fast manga translation, and "Langaku," an English extensive-reading app using manga. Mantra has received numerous awards, including the HONGO AI Award (2019), Weekly Toyo Keizai's "Amazing Venture 100" (2020), the AAMT Nagao Award (2021), the JEITA Venture Award Early Edge Award (2022), the Digital Publishing Award Challenge Mind Award (2024), the Grand Prize in the Self-Improvement Category of Google Play Best of 2025 (2025), and the Excellence Award in the Learning App Category of the Appliv Best App Award (2025). Contact. Mantra Inc.: Funakoshi E-mail: [email protected]

Active Gaming Media Inc.
Apr 16th, 2026
Square Enix partners with AI manga translation company to automate typesetting process which takes "3,000 of hours of manual work a year"

Square Enix partners with AI manga translation company to automate typesetting process which takes "3,000 of hours of manual work a year" By delegating routine tasks to the AI-powered Mantra Engine, Square Enix hopes to streamline the manga editing process. Mantra, a Tokyo-based company that develops AI technology specialized in manga translation, has announced that it's co-developing an AI tool to automate the typesetting process in manga together with Square Enix (via PRtimes). The joint project was launched following Square Enix's investment in Mantra in 2024. Titled "Mantra Engine," the tool is designed to assist with text layout and typesetting for manga in Japanese. While it uses image recognition and style estimation technology developed through Mantra's AI translation tool, the developers emphasize that Mantra Engine only uses what's already there in a manuscript, with no generation, modification or data training happening. According to the press release, the process of specifying font type, size and style as well as placement of each line of dialogue in a manga by hand takes over 3,000 hours annually at Square Enix's editorial department. The Mantra Engine project was launched from the need to streamline this process, as Square Enix executive Katsuyoshi Matsuura comments, "This tool was developed to optimize the workload of editors by combining the ideas of editors on the front lines with our company's AI expertise cultivated over more than 10 years in the digital entertainment sector, as well as Mantra's technology. Our goal is not merely to improve efficiency, but to create an environment where editors can focus more on their core duties - supporting authors' creative activities, by having AI handle routine tasks." Square Enix's manga publishing business primarily revolves around the Monthly Shonen Gangan publication (best known for the Full Metal Alchemist series) and Gangan Online app (Japanese only), with the more recent addition of the global Manga UP! digital platform. The Mantra Engine tool is currently being tested and improved at Square Enix, and after it's implemented internally, the developers plan to offer it as a service to the entire manga industry. Amber V. Editor-in-Chief since October 2023. She grew up playing Duke Nukem and Wolfenstein with her dad, and is now enamored with obscure Japanese video games and internet culture. Currently devoted to growing Automaton West to the size of its Japanese sister-site, while making sure to keep news concise and developer stories deep and stimulating.

Mantra
Apr 16th, 2026
Mantra, an AI manga translation company, jointly develops manga Typesetting Specification Engine with Square Enix.

Mantra, an AI manga translation company, jointly develops manga Typesetting Specification Engine with Square Enix. - Streamlining approximately 3,000 hours of annual manual labor for editors; phased rollout begins following successful beta testing - Mantra Inc. (Headquarters: Bunkyo-ku, Tokyo; CEO: Shonosuke Ishiwatari; hereinafter "Mantra"), a developer of AI technology specialized for manga, has jointly developed an AI technology with Square Enix Co., Ltd. (Headquarters: Shinjuku-ku, Tokyo; President and Representative Director: Takashi Kiryu; hereinafter "Square Enix") to automate the "typesetting specification" (shokusetsu shitei) process in manga editing. Following the completion of beta testing, phased implementation has begun within Square Enix. Note: This technology is designed to assist in the arrangement of text and layout for existing manga manuscripts. It does not generate, alter, or train on the actual artwork or creative expression of the manga. This project was realized through a collaboration established following Square Enix Holdings' investment in Mantra in 2024. It applies the image recognition and style estimation technologies that Mantra cultivated through the development of its manga translation tool, "Mantra Engine," to the Japanese manga editing process. Moving forward, the two companies will continue to verify and improve the system within Square Enix to enhance usability and operational efficiency, with the long-term goal of offering the product to the entire manga industry. What is "Typesetting Specification"? - why it takes 3,000 hours a year. "Typesetting specification" is the process of individually designating the font type, size, style, and placement for every line of dialogue in a manga. For instance, even for the same character, different fonts and styles are used for daily conversation, shouting, internal monologues, and narration. Applying the appropriate font is a crucial step that directly impacts the storytelling and the reader's immersion. Editors currently perform this manually for every single line of dialogue - ranging from dozens to hundreds per chapter. At Square Enix's editorial departments, more than 3,000 hours per year are spent on this task. As the volume of manga publications continues to grow, streamlining this process has become an urgent challenge for the editorial field. Manual typesetting specification with a dedicated scale. cMiyuki Tonogaya/SQUARE ENIX Overview of joint development. In this joint development, Mantra applied its manga image analysis and style estimation technologies to create an "AI Typesetting Specification Tool." Key features include: * Structural Analysis of Speech Bubbles and Dialogue: Automatically analyzes the shape of bubbles, text content, character count, and number of lines. * Automatic Text Layout Estimation: Proposes the appropriate "kyusu" (character size) and positioning based on the size of the bubble. It also estimates the suitable font type and style by identifying the bubble's shape (e.g., standard, thought, scream, or narration). * Custom Design for Editorial Needs: Based on interviews with Square Enix editors, the tool includes an intuitive UI and a "Typesetting Preview" function to ensure practical usability for professionals. AI Typesetting Specification Interface The AI analyzes the "speech bubble shapes" and "character data as symbols" from the manuscript on the left, then proposes font styles and character sizes within the bubbles of the manuscript on the right. cMiyuki Tonogaya/SQUARE ENIX Beta test results and feedback. A beta test conducted within Square Enix editorial departments (covering 1,516 pages) yielded a 73% overall satisfaction rate. Notably, 100% of respondents expressed a positive stance toward continued use. Regarding operability, 60% found it "easy to use," praising the intuitive UI even for first-time users. While there is room for improvement in AI analysis accuracy and processing speed - which will be the focus of future development - participating editors commented: * "I can now progress with typesetting specifications while handling other tasks." * "It saved me the trouble of handwriting font instructions, making the work much easier." Future outlook. With the beta phase complete, phased implementation is underway. Mantra and Square Enix will continue to refine the tool for better usability and eventually aim to commercialize the product for other publishers and companies. Executive comments. Katsuyoshi Matsuura, Executive Officer & Publisher, Square Enix Co., Ltd.: "This tool was developed to optimize the workload of editors by merging the ideas of those on the front lines with Mantra's technology and the AI expertise Square Enix has cultivated over a decade in digital entertainment. Our goal is not just efficiency for its own sake, but to create an environment where editors can focus on their primary mission: supporting creators' activities, while AI handles routine tasks." Shonosuke Ishiwatari, CEO, Mantra Inc.: "Since our founding, Mantra has developed AI to streamline manga translation. I am truly delighted that the core technologies we built for that purpose can now serve the editors who bring manga to life. I would like to thank everyone at Square Enix for their partnership. Mantra will continue to build technology that helps more incredible stories reach more fans." About the companies. Mantra Inc. Founded in 2020 with the slogan "Manga for everyone, in every language," Mantra develops AI specialized for manga. Its products include "Mantra Engine" and the English learning app "Langaku." The company has received numerous accolades, including the HONGO AI Award (2019) and Google Play Best of 2025 (Self-Growth Category). Square Enix Co., Ltd. Square Enix is a leading global entertainment company that develops, publishes, and distributes high-quality content including games (HD, online, mobile), manga, and magazines. It also leverages its IP for merchandising, animation, and live-action projects. Media Inquiries: Mantra Inc. PR: Funakoshi Email: [email protected]

ITmedia
Jun 26th, 2024
Mantra Raises ¥780M for AI Translation

Title: "Manga AI Translation Startup Raises ¥780 Million from Shueisha, Shogakukan, KADOKAWA, and Square Enix HD" Mantra, a Tokyo-based startup specializing in AI manga translation, announced on June 26 that it has raised ¥780 million from investors including Shueisha, Shogakukan, KADOKAWA, and Square Enix Holdings. The funds will be used to improve AI translation accuracy and expand the technology to novels, games, and videos. Mantra's tool, Mantra Engine, supports multiple languages and is already used for translating popular manga like "ONE PIECE" and "SPY×FAMILY."

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