Haru Saotome is attractive and charismatic, allowing him to lead a promiscuous life, and he's not a fan of his classmate Kuronagi.
Kuronagi is a quiet introvert and Haru never knows what he's thinking.
One day, Kuronagi insulted Haru out of the blue, leading him to say, "You have a baby face so I'm sure you have no idea how to have sex!" To which Kuronagi replied, "Then show me!" But then Kuronagi made Haru come after playing with his ass!
Haru ends up falling more and more for Kuronagi because of how good that felt as well as Kuronagi's surprisingly kind personality!