Mitsuru Jōgasaki

Mitsuru Jōgasaki (城ヶ崎　充, Jōgasaki Mitsuru) is a troublemaker of Kaimei High School. The Sket Dan and Sasuke frequently get his name wrong, resulting in him having a large number of nicknames. He is almost always seen together with his friend Saburō, and has a crush on Chiaki.

Backstory
He attended the same elementary school as Teppei, where he bullied Teppei.

The Paint-Mask Incident
After Jōgasaki is caught committing vandalism, he is cleaning the mess on the wall as punishment. When he notices Teppei, he forces Teppei to attack Bossun and his group. Though, Bossun finds out and helps Teppei to stop himself. When Bossun reveals Jōgasaki's whereabouts, Jōgasaki and his group get beaten down by Himeko.