Founder
Hiroka Koizumi
CEO / AI Craftsman
Since childhood, has entertained people through creative activities like games, manga, and music. Later invented the basic model of social games and built a service with 700,000 members. Overcame business bankruptcy and engaged in AI R&D for 10 years since 2015. From June 2025, focused on building AI organization, assembling a 27-member team in 5 months. Supports business transformation using AI based on 45 years of experience.
Career
Invented User-Participatory Games
Life in Indonesia. In an environment with limited entertainment, developed the interactive game "Word Adventure" with branching scenarios to entertain his younger brother. This became the origin of creating content that deeply understands users and generates engagement.
Founded Manga Club, Cultivated Leadership Qualities
During elementary school, found the illustration-only manga club boring and founded a new club. Led 20 members across Sendai and Tokyo. Cultivated leadership qualities.
Started Programming and Game Development with Basic
First exposure to programming through Basic, began developing original games. Created card games featuring real friends, turning home into a gaming venue. Wanted original BGM for self-made tabletop games, began composing music with piano started at age 9.
Achievements in Manga and Music
Manga drawn at 18 won Weekly Spirits award. During university, learned HTML and started homepage creation business. Self-made MIDI site selected as Apple recommended site, marking recognition of content creation ability and technical skills.
Experienced IPO 2 Years After Joining
Joined major mobile content company. Gained experience editing and producing services with 2 million members. Involved in launching customer support center. Company went public 2 years after joining, experienced growth process of listed company as shareholder.
Invented Social Game Model, Acquired 700,000 Members
Started business at 29 to contribute to hometown Sendai. Invented basic model combining SNS and games (card synthesis, gacha mechanics), acquired 700,000 members. Later experienced trial of business bankruptcy.
Business Recovery and Establishment of Gizin Inc.
Recovered from bankruptcy experience, contributed to establishing Sendai branch aiming for TSE listing. Established Gizin Inc. with direct transactions with major telecommunications carriers, assumed position of CEO.
10 Years of AI Research and AI Organization Building
Started chatbot business in 2015. Researched AI technology for 10 years through collaboration with major companies, co-founding AI startups (appointed CDO), joint research with universities, etc. Focused on generative AI possibilities, concentrated on building AI organization from June 2025. Assembled 27-member specialist team in just 5 months, built "AI Factory" system enabling high-speed service development.