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…
Leon’s departure from the apartment he shared with Aoi and Shusei leaves a noticeable hole in the couple’s daily life, leading them to make a surprisingly serious decision. As rumors abound through the halls of their high school, the two decide it best to end their cohabitation until graduation, though all it does is lead to loneliness on Aoi’s part. Noticing this, Soju (partially forces) Aoi out on a date to cheer her up while playing the part of the caring older brother to Shusei, only leading to more chaos.