- Name: Kotaro Yamazaki / yama_ko
- Position: Movie Designer
- Website: http://www.yama-ko.net/
- Twitter: https://twitter.com/yama_ko
- YouTube: https://www.youtube.com/user/MattariFactory
Kotaro Yamazaki is a motion graphics designer and commissioned video artist whose first work for beatmania IIDX was in Resort Anthem. Outside of BEMANI, Yamazaki is one of the core staff members behind the annual visual showcase event, FRENZ. They have also done video work for popular entertainment franchises like Granblue Fantasy and Tokyo 7th Sisters, as well as various VOCALOID songs.
- 惑星☆ロリポップ (with 月見堂 & S子)