1. Stay crazy and keep challenging
  2. Create emotional value
  3. Don't waste time on processes and politics



Hironao KunimitsuDirector / gumi Inc. Founder & chairman of board of directors
Makoto MotoyoshiAuditor / gumi Inc. CFO
Yoshiki OkamotoAdvisor / Deluxe Games, Inc. Producer
Mai FujimotoAdvisor / gracone Inc. CEO
Kohei NakamuraAdvisor / TokenPocket Inc. Founder
Kazuki KogishiAdvisor


A blockchain MMORPG "My Crypto Heroes" that can be played on a smartphone / PC. From the first day of the official service launch on November 30, 2018, it has been ranked No. 1 in the world in transaction volume, transaction volume and DAU as an Ethereum-based blockchain game. At the end of 2018, the industry's first TV commercial was aired. The world's No. 1 blockchain game that still maintains the top ranking.
Published by MCH Co., Ltd.

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My Crypto Saga is a intensified real-time card game for 2 to 4 players. Use “Kami Cards“ and their special skills to organize a winning deck that'll beat your rivals! The Kami-Power (KP) you gain by winning battles will turn your Kami-Cards into “Shin-Cards“ with special abilities! Shin-Cards can be freely traded between users.

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A development support program that provides a basic free of charge to users who participate in the program, such as blockchain game development companies and teams, by converting the system and know-how developed in the popular blockchain game "My Crypto Heroes" into a framework. By using the "MCH +" framework, a full-scale blockchain game can be developed in a short period of time, even without the know-how of developing a blockchain game.

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1 . NFT Produce Business

We provide a one-stop service that includes strategy development, concept design, UI/UX design, development, selection of blockchains to be used, and legal and taxation issues specific to NFTs, in accordance with the needs of content holders.

2 . NFT publication sales support business

We utilize the elements of NFT issuance and sales as a framework necessary for implementing NFT production, and provide optimal solutions tailored to customer needs. We also provide support for secondary distribution revenue distribution processing, sales aggregation that is compatible with the accounting procedures of listed companies, and the issuance of unique contracts.

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Number of blockchain game players The world's No.1 “My Crypto Heroes” team presents a long-awaited new work from all over the world. The world of the Brave Frontier app game, which boasts a total of 38 million downloads worldwide, merges with MCH proprietary system MCH+ that has changed the history of blockchain games.

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Press release
Announcement of partnership with Stake Technologies, one of the core companies behind Plasm Network and Shiden Network.[Detail]
Press release adopts LINE Blockchain for “Shi-San-Sei Million Arthur”, an NFT Digital Sticker using Square Enix’s IP.[Detail]
Press release launches ''N Suite'' with the core of NFT Management Wallet for business that enables private key management by multiple people![Detail]
Press release
The newest NFTs Game “ My CryptoSaga ” Official Service Launches on May 31st! And, Auction of Original Art NFTs of MyCryptoSaga will start at UTC 12:00 on the same day.[Detail]
Press release
NFT x calligraphy project “Crypto Souun” launched by calligrapher Takeda Souun[Detail]
Towards Sustainability of NFT[Detail]
Press release
double and gaming giant SEGA partnership for global expansion of NFT utilizing SEGA’s IPs[Detail]
Press release partners with Flow to launch Flow’s ValidatorNode![Detail]
Press release announces NFT business support service ''NFTPLUS'' to promote entertainment DX with NFT![Detail]
Press release
Music creator Nor will issue a special “Co-creation NFT” of his first original Vocaloid music Hai-iro Psychologic feat. Hatsune Miku.[Detail]
Press release
Japanese creator GODTAIL will co-create illustrations live for auction and give special rights to buyers![Detail]
Press release and BeyondConcept begin joint research into treating NFTs in virtual space (VR)![Detail]
Press release
Partnership with double Inc. and Immutable X[Detail]
My Crypto Heroes starts to sponsor MCH Coin to the other blockchain game titles![Detail]
Press release
MCH+ title will adopt “Polygon (previously Matic)’’ through Asset Mirroring System![Detail]
Press release
Launch of NFT 3D Creatives, an NFT-ization project using 3DCG technology in the entertainment field, is scheduled for April.[Detail]
The Partnership with Square Enix and the New World Envisioned by Blockchain Games and NFT[Detail]
Press release
double partnership with Square Enix to collaborate on NFT content development[Detail]
Press release
MCH+ partners with Rarible[Detail]
Press release
In order to promote the formation of a domestic NFT market, three blockchain content companies have formed a business alliance.[Detail]
Press release
Original Smash-hit, My Crypto Heroes (MCH) returns with Invite-Only Premiere Beta of My Crypto Saga (MCS)[Detail]
Press release
double Forms Partnership with Matic Network![Detail]
Press release
Why We Established MCH Co.,Ltd[Detail]
Press release
Blockchain Content Association becomes an incorporated association[Detail]
Press release
My Crypto Heroes × “Armor Shop for Ladies &Gentlemen” Collaboration![Detail]
Press release
Released the β version of the 'Mirroring System', which supports multi-chain support for blockchain games, and started a demonstration experiment with the NFT exchange “miime”![Detail]
Press release
More freedom for the NFT! Four blockchain content-related companies collaborate to create a common specification, Oct-Pass, for the interuse of NFTs between different applications and blockchains.[Detail]
Press release
My Crypto Heroes Issues Governor's Token, 'MCH Coin'[Detail]
Press release
MCH+ Partner “CHOJO -CryptoGirlsArena-” released! [Detail]
Press release
We’re partnering with Torus Labs to develop an Ethereum wallet with social logins![Detail]
Press release
Launched “MCH+ADX”, a network for attracting customers between games to expand the blockchain game market.[Detail]
Message from Master.Nob (Hironobu Ueno)[Detail]


NFT Producer / Marketing

NFT business planning and marketing, project management

Back-end engineer

Backend development with Go / Rust

Engineering Internship

Web application development / analysis work


For inquiries about games, please contact each game.

Company Namedouble Inc.
Company Address4-34-7 Nishi-Shinjuku, Shinjuku-ku, Tokyo
EstablishmentApril 3, 2018
Business descriptionDevelopment, operation and sales of games and assets using blockchain technology
Member Organizations

Blockchain Contents Association

Re-building the future of gamingwith blockchain technology!