Usami Yuuna
宇佐美 優奈
| Usami Yuuna宇佐美 優奈A | |
| Measurements | Height: 150cm, Bust-Waist-Hips: 70-53-76cm |
| Birthday | 1 November |
| Hair | Ahoge, Blue, Shoulder-length, Sidehair, Spiky Bangs, Twin Tails |
| Eyes | Garnet, Tsurime |
| Body | Pale, Slim, Teen |
| Clothes | Naked, Necktie, Over The Knee Socks, Pajamas, Ribbon Hair Tie, Sailor School Uniform, School Uniform |
| Personality | Brother Complex, Tsundere |
| Role | Domestic Partner, Full Sister, High School Student, Student Council Member |
| Engages in | Cooking |
| Subject of | Teasing |
| Visual novels | Main character - Iinazuke wa Imouto-sama! |
| Voiced by | Manaka Umi |
DescriptionShun's younger sister who is a first-year high school student. She's a good cook and homemaker such that Shun comments that she will make a wonderful bride someday. | |