Kouno Sanae
河野 早苗
| Kouno Sanae河野 早苗O | |
| Measurements | Height: 163cm, Bust-Waist-Hips: 94-59-90cm, H cup |
| Birthday | 19 October |
| Hair | Brown |
| Eyes | Brown |
| Body | Young-adult |
| Clothes | Glasses, Suit |
| Personality | Clumsy |
| Role | Non-blood-related Sister, Teacher |
| Visual novels | Main character - Mamasen |
| Voiced by | Kirishima Haruna |