With the proposal, "Let's make a baby". High school student Kotori is roped up into a fake relationship with Sei, the head of the wealthy Takamiya family. Even though Kotori's traumatic past makes her uneasy with other people, she can't escape this situation, but Kotori isn't the only one with secrets. Being forced to visit Sei every day, actually shows he's keeping some of his own! As the Takamiya family aims to continue its lineage, Kotori's gradually getting caught up in their schemes. Clumsy, but also straightforward, this story follows a lonely girl and a troubled nobleman's son's love story.