GIZIN was started on April 4, 2014 in Sendai, Japan with the idea of making the Internet more friendly.

We use the Internet to help make your services more vibrant and attractive, and to deliver excitement to your users. I look forward to working with you.

President’s Profile

Hirokazu Koizumi

She is a returnee from Indonesia and a former manga artist who won the Weekly Spirits Newcomer Award. In 1999, he joined Cybird, Inc. Launched a number of content and support centers and went public in two years. To put this experience to use in his hometown, he founded K sound design Inc. in Sendai, Japan, and worked with major companies. Invented the card synthesis and gacha system, pioneered the social game market, and successfully raised funds from VCs. Affected by the Great East Japan Earthquake. He then turned inventor and immersed himself in researching new technologies and filing patents, and in 2014, he founded GIZIN Inc. Now, as an independent developer, he interacts with developers from all over the world.

Business Results

NTT DoCoMo, Inc.
Panasonic System Networks, Inc.
Suntory System Technology Co.
LINE Corporation

granted patent

patent pending 2016-116154

Development Results

2D action game “SWISCAPE”.

service site swiscape.com

LINE chatbot “Maman’s Tarot Divination”.

LINE official website introduction page

Social game “Mobile Wars”



iOS app and chat game “Curun”.


History of the company

2014年4月 Founded in Sendai City, Miyagi Prefecture.
2014年6月 Moved head office to Nishiki-cho, Aoba-ku, Sendai City.
2015年2月  Released the iOS app “Curun”.
2015年9月 Social game “Mobile Wars” released for Sosei
2015年10月 Moved the head office to Fukusawa-cho, Aoba-ku, Sendai City.
2016年4月 ChatBot Developer Sendai, a community for sharing chatbot information, started its activities.
2016年11月 Established Tokyo office in Chiyoda-ku, Tokyo.
2020年2月-3月 SWISCAPE” 2D action game released on AppStore, GooglePlay and Steam.

Media Coverage

The article was featured in the “New spirits! New power for Sendai” corner of the monthly “Reconstruction People” volume 40.


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