棟本 椿子

Tsubakiko is a girl that hates guys.

 Tsubakiko was bullied very badly in her elementary school by boys and her name was made fun off but that made her timid towards boys and she doesn't hate them yet. 

In her middle school, she revealed that a guy that she got along with tried to befriend her so that he can sleep with her. She over heard it and after that she felt sick and started hating boys. The only boy that can touch her is Yukito as she will not feel ill.  /

 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. /