Kyohei Doujima  

, 堂島凶平

One of Rikus classmates resembles a tough, muscular bouncer. This student has sworn to safeguard Sayumi from other boys until they meet Riku. Doujima frequently assaults him brutally when Mr. Chick confronts Riku. Following the first beating, Doujima believes that Riku is capable of protecting Sayumi and insists that he be with her. Now, Doujima hangs out with Riku and his friends.