Kensuke, an older student whom Tamaki had admired since high school, moves into the apartment next to hers. Kensuke had become a successful CEO of an IT company and acquired a huge fortune, moving up in the world. In order to protect Tamaki, a magnet for useless men who is being harassed by her ex-boyfriend, Kensuke decides to pretend to be her boyfriend! In exchange, Tamaki must clean up his messy apartment. Although it was only supposed to be a pretense, Tamaki is flustered by the older man's gentle protection...