Sawanoki Yuu
澤之木 優羽
| Sawanoki Yuu澤之木 優羽A | |
| Birthday | 4 September |
| Hair | Black, Blunt Bangs, Bob Cut, Short |
| Eyes | Tareme, Violet |
| Body | Pale, Short, Slim, Small Breasts, Teen |
| Clothes | Ankle Socks, Mary Jane, Miniskirt, Necktie, Old Type School Swimsuit, One Piece Swimsuit, Sailor School Uniform, Skirt, Tracksuit |
| Personality | Kind, Watashi |
| Role | High School Student, Lonely, School Swimming Club Member |
| Engages in | Swimming |
| Visual novels | Main character - Once more Again |
| Voiced by | Iwaizumi Mai |