Chika Koizumi

Chika is the childhood friend of Ryta and in their romantic relationship with each other she often takes the lead role. She has a crush on him and despite her best attempts she is unable to get Ryta to notice. She is fond of her childhood memories that she shares with Ryta. She is very levelheaded and has an unyielding spirit unafraid to play pranks on Ryta no matter what position they leave him in and physically abusing Ryta should he deserve it. Her number on the class list is 10. Source: Wikipedia