Tsukiko Tsutsukakushi

Gender: Female
Age: 15-16
Birthday: January 21
Sign: Aquarius
Blood Type: A
Height: 4'11
Occupation: Student

She meets the main character in the beginning of the manga. She ends up losing her emotion because of the infamous Stony Cat. She helps out Youto find the person who obtained his lost trait, in order to regain her own.

It is later revealed that she is Tsukushi's sister and that her family owns the area where the cat statue is.