八重山 瞳

A married woman who lives next door to Shouta, as a fellow full time housewife Rena looks to her as a senpai. She is skilled at domestic chores and use to handle cooking and cleaning for Shouta and Raita before Rena came, now she is teaching Rena how to cook.

Though she has been married for 10 years she has not been blessed with any children, and wants to look into infertility treatment with her husband but he claims there is no need to rush.

She is gentle and caring and looked after Shouta as if he were her own son but since Rena became his step mother she has become estranged from him.