Sekijima Mika
関島 美香
| Sekijima Mika関島 美香 | |
| Measurements | Bust-Waist-Hips: 80-55-82cm |
| Hair | Brown, Sidehair, Twin Tails, Waist Length+ |
| Eyes | Teal |
| Body | Olive, Slim, Teen |
| Clothes | Ribbon Hair Tie, School Uniform, Sports Uniform, Wristband |
| Personality | Envious, Modern Tsundere, Proactive, Tomboy |
| Role | Daughter, High School Student, Honor Student, Older Sister, Popular, School Athletic Club Member, Step Sister, Triplet+ Sister |
| Engages in | Athletics |
| Visual novels | Main character - Onii-chan, Erande yo! ~Kyuu ni Kawaii Mitsugo no Imouto ga Yattekite Chou Yabai~ |
| Voiced by | Nagi |
DescriptionThe oldest of the triplets. While she is an honor student with a strong sense of responsibility and is also one of the best members of the track and field club, she has the worst cooking skills out of the three. She has a complex about her small breasts. | |