Aoi Nishimori is a high school girl who lives alone in her own apartment, but to her surprise, she discovers that the prince of her school, Shusei Kugayama, has moved in next door! To add to this, a series of crazy happenings result in the two living together under a single roof! Shusei is known to be a heartless guy and Aoi particularly hates him after he coldly rejected her best friend, so a life of cohabitation seems like a recipe for disaster. And yet, Aoi somehow can’t stop her heart from pounding when she’s with Shusei…
Things are heating up as graduation approaches! Aoi and Shusei are still madly in love despite being forced to live separately as they spend their very first Christmas together as a couple. The two end up going to an amusement park on a date, and afterwards, Shusei makes a shocking decision in order to ensure they stay together—forever. As their story winds to a close, Aoi and Shusei will discover the true meaning of the word “family.”