Katsuragi Mizuho

The mother of his best friend Yuya. She has been concerned about Kazuki's mother's absence since kindergarten, and has always invited him to her home.

She trusts Kazuki as her son's best friend. She is a soft and cheerful mother who treats everyone equally. She has only had sex with her husband and has little skill and knowledge.

Since she has not had sex with her husband for a long time, she falls in love with the youthful and energetic Kazuki.