A high-school girl acquires the ability to time travel.
Aoi lives in an apartment by herself. Shusei moves in next to Aoi's apartment. Shusei is a very popular student. Due to a mistake, Aoi makes the sprinkler go off in his room. Until his room is fixed, he stays with Aoi.
Miyazaki asks Noboru and Momose to pretend they are dating to stop bad rumor about him. Both begin to act like a couple in front of others and soon he begins to develop feelings for Momose, who is still in love with Miyazaki.