Toka Maruishi (丸石 燈花 Maruishi Tōka)
is a side character of Seiren
. She is a member of swimming club and a friend of Miu Hiyama
- The name Toka means "light, lamp" (燈) (to) and "flower, blossom" (花) (ka).
- Toka's surname Maruishi means "round" (丸) (maru) and "stone" (石) (ishi).