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…
Although Aoi’s father found out about their housing situation, Aoi and Shusei are still allowed to live together, but on one particular condition…Before long, the two of them begin their final year of high school, and end up in the same class. Now the couple will be together around the clock! However, with Shusei as a classmate, Aoi is disappointed to see a side of him that she’s never seen before. She must balance her friendships, both new and old, but what will she do about her own roommate?!