The manga centers on the relationship between Rin and Momoka, two childhood friends. When Rin's household life is upended after her promiscuous mother suffers consequences, she is taken in by Momoka's family, and Momoka becomes a valuable pillar in Rin's life. But as they grew older, Momoka entered into relationship after relationship with men, and Rin could not help but see the actions of her mother reflected in her friend. When Rin asks Momoka to stop, Momoka asks Rin to love her instead.