Tsukiko Tsutsukakushi

Age: 15-16
Gender: Female   

Height: 149 cm

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 Yuto 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.