Munemoto Tsubakiko

Tsubakiko was badly bullied by boys in elementary school after her name was accidentally misread to the class as "Chinko," which only escalated further after her severe reaction to it. She became apprehensive towards men as a result, but did not harbour deeper feelings of repulsion until middle school, when she overheard a male senpai she trusted sexualising her with another boy.

She transferred away to an all girls school right after, but eventually came to idolise Yumeko, who she saw on television, as Yumeko was more powerful than men. After time, she began attending the same school as Yumeko's kouhai.

In Navel*Plus Tsubakiko and Yukito are living together and Tsubakiko is now a senior in her school. She is also revealed to be an older sister now.