Ikariishi is the strong, silent type. He's the top dog of Masu Junior High along with his friends Utsunomiya and Takamizawa. One day, however, things start to change when he meets a girl that drags him along to cram school. Can Ikariishi afford to spend his time studying for entrance exams, with danger not far behind him?

The story centers on a group of friends who are satisfied and complacent with their everyday lives. The friends include Tobio, a passive high schooler who makes it a rule not to hope too much; Maru, a scheming boy who gossips behind people's back; Isami, a gaudy student who likes girls and recently got a girlfriend with big breasts; and their senior Paisen (slang for senpai, or upperclassman), a 20-year old man who is rich and has long graduated from high school.