2003

Asakura Yuu has his briefcase switched with a man at the train station. When he looks inside, he finds gun, money, and an assassination order! Partnered together with an assistant, codename "Angel," he enters into a dark world of murder, violence, and of course sex.

Natori Hana is an earnest, good-natured 25-year-old woman whose cousin refuses to go to high school. Hana takes her cousin's place and attends the high school. On her first day, though, Hana's ruse is discovered by her former high school classmate Kanie Akito - who happens to be the high school's world history teacher.