Between Oohata Kazunari and Nakamatsu Yae is a secret that they can’t tell others. That is the fact that they’re『cohabiting』. However, on the first day of school as third-year high school students, their secret ended up exposed to their classmates because of a tiny incident. From there, the pair’s relationship started to change…… This is a story about a pair who aren’t dating『yet』until they date.