Sasayama Yui
笹山 優衣
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| Sasayama Yui笹山 優衣 | |
| Measurements | Height: 152cm, Bust-Waist-Hips: 72-54-77cm |
| Hair | Blond, Twin Tails, Waist Length+ |
| Eyes | Violet |
| Body | Pale, Small Breasts, Teen |
| Clothes | Hairpin, Mini-dress, Naked Shirt, One Piece Swimsuit, Ribbon Hair Tie, School Uniform, Shimapan, Shorts, T-shirt, Thigh-high Stockings |
| Items | Lollipop |
| Personality | Brother Complex, Modern Tsundere |
| Role | High School Student, Kouhai, Twin Sister, Younger Sister |
| Subject of | Piggyback Ride |
| Visual novels | Main character - Sis Koi |
| Voiced by | Ueda Akane |