Mayama Ritsuki and Kyoya cross the line between brother and sister in the heat of the moment. They then realize that they like each other’s bodies. However, the situation remains the same, with them fighting every time they meet. On their first night together while their parents are away on a trip, they start fighting […]

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.