Aoi Nishimori's parents moved to another city for work, but Aoi didn't want to transfer to a new high school. She stays behind and lives in an apartment by herself. Shusei Kugayama moves in next to Aoi's apartment. Shusei is a very popular student at their high school. Due to a mistake, Aoi makes the sprinkler go off in his room. Until Shusei's room is fixed, he stays with Aoi.

Haruna who devoted herself to softball decide to find a boyfriend in high school by instruction from Yoh, who is willingly to teach her how to get a boyfriend but with only one condition, don't fall in love with him at all.