Ryusei Hiyoshi plays rugby for Isui University as wing or fullback, wearing jersey number 24. He employs unconventional, dance-like footwork during matches, disrupting opponents' defenses with his agile movements. In a game against Doshisha University, this style poses significant difficulties for Yasunari Tsuru, reminding him of Natsusa Yuzuki's former play and creating a psychological challenge. Ryusei scores at least one try, contributing to Isui's victory. He holds strong admiration for Natsusa Yuzuki, crediting him as the inspiration for starting rugby and actively attempting to replicate his characteristic movements on the field. Before their match, Ryusei approaches Natsusa to express his respect and request an autograph, though another Isui team member intervenes, deeming Ryusei's enthusiasm potentially bothersome.