Kokoro likes Warabi more than she lets on, and is disappointed with herself because she often acts cold around other people even though she doesn't really mean to, and while she tries to be nicer, it's not going well. She is also very short-tempered and the person who suffers the most from this is Wallaby himself. By the end of the series, Kokoro is led to think by Lalilalulala that Wallaby might have run away because of Kokoro's behaviour (including forcing Wallaby to sleep in her drawer – even though it was dark and cold in there, refusing to give him any blankets, and rejecting his wish to accompany her on her way to school), however this was not the case as Wallaby had simply been taken by Emi. The character being called Kokoro is ironic since the name means "heart" in Japanese, while