Akizuki Saki
秋月 沙紀
| Akizuki Saki秋月 沙紀 | |
| Hair | Spiky Bangs, Teal, Twin Tails, Waist Length+ |
| Eyes | Tsurime, Violet |
| Body | Pale, Teen |
| Clothes | Old Type School Swimsuit, Ribbon Hair Tie, School Uniform, Sport Bloomers, Thigh-high Stockings |
| Personality | Genius, Loner, Stoic, Strange |
| Role | Full Sister, High School Student, Younger Sister |
| Engages in | Teasing |
| Visual novels | Main character - Boin Shimai no Kojin Jugyou |
| Voiced by | Sasaki Akari |