Shunji Tagawa

An unemployed man learns that his ex-girlfriend was murdered. He suddenly finds himself travelling through time to his middle school years and has chance to change the future and save the girl. He aims to rise to the top of the most brutal delinquent gang.

Students, including Aoi Nishino, take part in class and sports activity at a prestigious high school. Aoi Nishino is a member of the school's archery club. He practices archery studiously and doesn't socialize much with the other students. His childhood friend Haruka Seno is also a member of the archery club, but she worries about Aoi Nishino. One day, thunder strikes the school grounds. After that, the ordinary lives of the students changes drastically. Many samurai descend on the school grounds. It appears that the entire school has traveled back in time to the Sengoku period. Making things worse, they realize that they are in the time right before the Battle of Okehazama takes place.

When Kazusa enters high school, she joins the Literature Club, where she leaps from reading innocent fiction to diving into the literary classics. But these novels are a bit more...adult than she was prepared for. Between euphemisms like fresh dewy grass and pork stew, crushing on the boy next door, and knowing you want to do that one thing before you die--discovering your budding sexuality is no easy feat! As if puberty wasn't awkward enough, the club consists of a brooding writer, the prettiest girl in school, an agreeable comrade, and an outspoken prude. Fumbling over their own discomforts, these five teens get thrown into chaos over three little letters: S...E...X...!