Koyama Yuu
小山 優
| Koyama Yuu小山 優 | |
| Hair | Grey, Shoulder-length, Spiky Bangs |
| Eyes | Tsurime, Violet |
| Body | Pale, Slim, Young-adult |
| Clothes | High Heels, Necklace, Skirt Suit |
| Role | Teacher |
| Visual novels | Side character - Koi Saku Miyako ni Ai no Yakusoku o ~Annaffiare~ |
| Voiced by | Aiba Mami |