| Yamamoto Mako山本 真子 |
| Hair | Claret, Long, Straight |
| Eyes | Blue |
| Body | Big Breasts, Mole, Teen |
| Clothes | Ankle Bracelet, Armband, Bra, Bracelet, Clothing with Ribbons, Glasses, Headband, Loafers, Panties, Pantyhose, School Uniform, Skirt, Straw Hat |
| Personality | Hotblooded, Kind, Modern Tsundere, Naive, Pragmatic, Proactive, Refined, Strict |
| Role | Betrothed, Discipline Committee Leader, Friend, Girlfriend, High School Student, Student Council Vice President |
| Engages in | Infidelity |
| Subject of | Blackmail, Netorare (they are the stolen SO), Seduction |
| Visual novels | Main character - Hoka no Otoko no Seieki de Harande mo Ii Desu ka...? 3 - Boku no Shiranai Tokoro de Iki Kurutteita Saiai Kanojo -Kimajime na Gakuen Fukukaichou- |
| Voiced by | Hamura Nao |
DescriptionStudent council vice president and protagonist's fiancé. Because she is daughter of old-fashioned family, she got strict personality and always pushes forward with her own belief despite lacking of experiences. She prohibits the protagonist from normal behaviors as couple like holding hands and kissing until marriage. |