Amami Misako

She was confessed to by Taito's father while she's working at the swimming school, which led to their marriage. She was also the instructor of Taito. Soon after, Taito's father died, and so right now, Misako and Taito lives together. Serious and gentle, she loves Taito as if he was her own child, but she's a bit overprotective.

Since Taito doesn't call her "mom", shes worried that he doesn't see her as his mother. When Taito told her that he wants to work part-time, she was against it at first, but thought that it's fine if she can watch over him, so she offered him a job at her swimming school.