Sasayama Miu
笹山 未優
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| Sasayama Miu笹山 未優 | |
| Measurements | Height: 155cm, Bust-Waist-Hips: 80-56-83cm |
| Hair | Red, Straight, Waist Length+ |
| Eyes | Green |
| Body | Pale, Teen |
| Clothes | Bikini, Hairpin, Mini-dress, Pajamas, Ribbon Hair Accessory, School Uniform, Shorts, Tank Top, Thigh-high Stockings |
| Items | Lollipop |
| Personality | Brother Complex, Mischievous, Smart |
| Role | High School Student, Kouhai, Twin Sister, Younger Sister |
| Visual novels | Main character - Sis Koi |
| Voiced by | Fujimori Yukina |