Koganei Tamaki
小金井 球紀
| Koganei Tamaki小金井 球紀 | |
| Measurements | Height: 166cm, Bust-Waist-Hips: 84-58-85cm |
| Hair | Blue, Hime Cut, Straight, Waist Length+ |
| Eyes | Green |
| Body | Pale, Slim, Teen |
| Clothes | Cardigan, Knee-high Socks, Loafers, Miniskirt, Necktie, Pantyhose, Ribbon Tie, School Uniform, Vest |
| Personality | Friendly, Hard Worker, Refined, Talkative |
| Role | Friend, High School Student, Kouhai, School Science Club Member |
| Visual novels | Side character - Miagete Goran, Yozora no Hoshi o: Fine Days Side character - Miagete Goran, Yozora no Hoshi o: Interstellar Focus |
| Voiced by | Ayumi Sarah |
DescriptionSaya's kouhai. | |