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. Shūsei Kugayama moves in next to Aoi's apartment. Shūsei is a very popular student at their high school. Due to a mistake, Aoi makes the sprinkler go off in his room. Until Shūsei's room is fixed, he stays with Aoi.
| Actor | Role |
|---|---|
 Ayame GorikiAoi Nishimori | Aoi Nishimori |
 Kento YamazakiShūsei Kugayama | Shūsei Kugayama |
 Akiyoshi NakaoRyōsuke Satō | Ryōsuke Satō |
 Rei OkamotoMoe Shibuya | Moe Shibuya |
 Anna IshibashiSatsuki Mizuno | Satsuki Mizuno |
 Reiko TakashimaSayoko | Sayoko |
 Seiji FukushiSoju Kugayama | Soju Kugayama |
 Miho ShiraishiKazumi Hoshino | Kazumi Hoshino |
 Takashi FujiiTeacher Onda | Teacher Onda |
 Renn KiriyamaWataru Sanjo | Wataru Sanjo |