Mochizuki Riko
望月 莉子
| Mochizuki Riko望月 莉子 | |
| Hair | Blue, Sidehair, Straight, Waist Length+ |
| Eyes | Blue |
| Body | Kid, Pale, Slim |
| Clothes | Miniskirt, Ribbon Headband, Tank Top, Thigh-high Stockings |
| Personality | Tsundere |
| Role | Full Sister, Younger Sister |
| Visual novels | Main character - Onii-chan no Osewagakari |
| Voiced by | Hiiragi Mafuyu |