With nothing left to lose, ordinary high school student Haruka Shinozaki confesses to beautiful, diligent class representative Akiho Kōsaka and to his surprise she accepts. Kōsaka takes dating as seriously as she does everything else, but does not quite get it. She pragmatically suggests activities that are too sexual.Haruka Shinozaki has been interested in the class representative, Akiho Kousaka, since his first year in high school. She is attractive, good at sports, and is an all-around model student. Since they are in the same class this year, Shinozaki decides to confess his feelings—and, to his shock, Kousaka agrees to be his girlfriend! However, he finds that Kousaka is a bit stranger than he first thought: this seemingly perfect girl has never been in a relationship. But even though she is inexperienced, she vows to please Shinozaki in every way she can… such as learning multiple sex positions or his fetishes. Shinozaki tries to assure her that her studies into such subjects aren’t necessary, but Kousaka devotes herself to making him happy in more ways than one.