Sun and Nagasumi attend their first day of school. Sun's parents, Gozaburo and Ren, use their political influence to get jobs at Nagasumi's high school as the homeroom teacher and school nurse respectively, along with Masa teaching maths and Shark Fujishiro teaching PE. To make matters worse, Nagasumi's perverted friend, Hideyoshi "Chimp" Sarutobi, falls in love with Sun. Nagasumi must survive constant attacks from his new so-called teachers except for Masa and Sun's mother, Ren, who supports Nagasumi and Sun's relationship. The next day, to avoid being eaten by Shark Fujishiro Nagasumi escapes through a classroom full of girls changing into their PE clothes and is promptly arrested by Mawari, who had also been changing her clothes. Despite all his suffering Nagasumi remains happy Sun is in his life.