Nagasawa Seika
長沢 星歌
| Nagasawa Seika長沢 星歌 | |
| Measurements | Height: 150cm, Weight: 47kg, Bust-Waist-Hips: 85-59-86cm, D cup |
| Birthday | 14 February |
| Hair | Black, Blunt Bangs, Spiky Bangs, Straight, Twin Tails, Waist Length+ |
| Eyes | Jitome, Pink |
| Body | Pale, Slim, Teen |
| Clothes | Knee-high Socks, Ribbon Hair Tie, School Uniform |
| Role | Full Sister, High School Student, Twin Sister, Younger Sister |
| Visual novels | Main character - Kokoro Rista! |
| Voiced by | Toono Soyogi |