Sumiko had straight hair, which she had tied into two low buns, held up by ribbons. She had a fringe covering her forehead, and she also wore a headband with ribbons, decorated with flowers at each side. She was usually seen wearing goth-lolita clothes.
Sumiko was described to be a kind and cheerful person by Touko, but she was bad when she drank a lot, and she used to sing alone when she drank.
Little of their interaction has been shown, but they seemed to be on good terms and Touko says that she miss those times when they used to sing cheering song's.
Hika and Sumiko were on good terms. When Touko asked what she wanted from their trip, Hika replied Sumiko. This shows that Hika misses Sumiko dearly and wishes to see her again.
Story EditFallen Crew's notebook, she spotted a person whom she didn't know. That being Sumiko, Touko explains who she was. That being she was a close friend of theirs but had one day left their group. Sometime later, Miki asked Touko who Sumiko really was. Touko replies that she really was their close friend, who likes to drink often and would sing songs while they were drunk. Ending discussion, Touko will tell them about her in more detail some other day.
Hika mentioned Sumiko after Touko asked her on what she wanted from their trip.
- Main article: Category:Sumiko