Mitsui Yuuko
三井 優子
| Mitsui Yuuko三井 優子 | |
| Hair | Brown, Long, Parted in Middle |
| Eyes | Brown |
| Body | Big Breast Sizes |
| Clothes | Cardigan, Old Type School Swimsuit, Pendant Necklace, Skirt |
| Personality | Refined |
| Role | Teacher |
| Visual novels | Main character - Hokenshitsu no Sensei ~Onedari Bakunyuu Lesson~ |
| Voiced by | Fukai Haruka |