Kozuya Riku
小鳥谷 凛空
| Kozuya Riku小鳥谷 凛空 | |
| Aliases | Ri-chan |
| Hair | Black, Blunt Bangs, Hair Loopies, Long, Straight |
| Eyes | Amber, Tsurime |
| Body | Pale, Slim, Teen |
| Clothes | Cupless Corset, Hair Tie, Hairpin, Knee-high Socks, Loafers, Miniskirt, Pleated Skirt, Sailor School Uniform, School Uniform, String Ribbon Tie |
| Items | Teacup |
| Personality | Mature |
| Role | Cousin, Daughter, High School Student, Kouhai, School Swimming Club Member, Schoolmate, Younger Sister |
| Engages in | Cleaning, Cooking, Swimming |
| Engages in (Sexual) | Not Sexually Involved |
| Visual novels | Side character - Soi Kano ~Gyutto Dakishimete~ |
| Voiced by | Tachibana Sara |
DescriptionKouhei's younger sister and Aika's cousin, she's really close with Aika. Similar to the siblings' mother, she has a very really mature personality and always takes care of the housework by herself. | |