Mei has been in love with Yuya all her life. They've grown up together. But when they reach their second year of middle school, Yuya suddenly professes his love for her older sister, Haruna.
| Actor | Role |
|---|---|
 Junpei MizobataNishino Atsush | Nishino Atsush |
 Nao MinamisawaTakemiya Mei | Takemiya Mei |
 Ryo KimuraTakahashi Riku | Takahashi Riku |
 Rei OkamotoYamagishi Mia | Yamagishi Mia |
 Hitomi MiyauchiNakagawa Sara | Nakagawa Sara |
 Toshihiro YashibaInoue | Inoue |
 Mio MiyatakeTakemiya Mei (young) | Takemiya Mei (young) |
 Manabu HamadaIshikawa Haruo | Ishikawa Haruo |
 Anna IshibashiTadokoro Mami | Tadokoro Mami |
 Kaoru HirataKawaguchi Miyabi | Kawaguchi Miyabi |
 Mirai YamamotoNishino Natsumi | Nishino Natsumi |
 Hiroshi YazakiShinozaki Yuya | Shinozaki Yuya |
 Kenji MatsudaMurakoshi Koichi | Murakoshi Koichi |
 Shigemitsu OgiMorisaki Takamichi | Morisaki Takamichi |
 Yanagishita TomoFujiwara Natsuki | Fujiwara Natsuki |
 Sayuri IwataTakemiya Haruna | Takemiya Haruna |
 Masahiro KomotoTakemiya Toshihisa | Takemiya Toshihisa |
| RRuka SawakiNishino Atsushi (young) | Nishino Atsushi (young) |
 Ryuya WakabaYasuda Shu | Yasuda Shu |
 Kosuke SuzukiDr. Ota | Dr. Ota |
 Sayaka YamaguchiIshikawa Machiko | Ishikawa Machiko |
| MMisaki YonemuraAi-chin | Ai-chin |
 Michiko IwahashiNot listed | Not listed |