謎の男

A mysterious individual with a huge muscular frame and seven scars on his chest. Legend has it that the circle he comes to at ComiPa will rise to the top.

His name is Tachikawa Yuzou, and he's Ikumi's older brother. Yuzou comes to the KomiPa venue on his sister's behalf and often appears in front of Kazuki, who his sister is interested in.