"The world average age for the first sexual experience... 17.3". Is that early? Late? Seno Sakura has a serious personality. Hara Tsumugi has never liked a member of the opposite sex before. Minagawa Yuna is experienced and is currently dating a company employee. At the age of 17, the girl's "sexual values" begin to fluctuate.

Nozomu Momochi works as a supermarket employee and lives without any dream and courage. He accidentally met his favorite manga creator, Tomoe Yuizuki and they became a couple. One day, a middle-aged man approaches Nozomu and calls himself Tomoe.

The story is set in the private senior high school Minami Gakuen which boasts of an unusually high proportion of good-looking students and aims to win at the National Ikemen Contest for senior high school students