|Anime||Episode 10 (mentioned)|
In the manga, Mitsuyo has long straight black hair and black eyes. She looks like Yukiyo.
Misaki said in the OVA that Mitsuyo still hopes Mei can forgive her. Also, she thinks of Mei as her daughter and wants to see her. Mitsuyo knows it was wrong to send Mei away. Misaki also said that she's still suffering. From what Misaki said, Mitsuyo seems to be a kind-hearted, gentle and, protective mother.
Before the start of the series, more than thirty years ago, Mitsuyo was born with her twin sister, named Yukiyo (or Kirika). They both got married and soon Mitsuyo was pregnant with twins. Those twins are revealed to be Mei and Misaki. Yukiyo also became pregnant with twins but she lost the pregnancy, leaving her devastated. At that time, the Fujioka family was experiencing financial difficulties. Because of this and the fact that Yukiyo was still trying to cope with the loss, Mei was given to her. After this, Misaki needed a kidney transplant. The giver was Mitsuyo. This information is never revealed in the anime.
In the anime Kouichi and Mei talked about Mei's mother, but it wasn't revealed her name until the OVA when she is mentioned by Misaki.
- In the anime she is never mentioned, except for the OVA.
- Mitsuyo is a unisex name that means "generation of light".