This semi-sweet loudmouth has the hots for Kotarou and can't stand the fact that Misha is homing in on her territory. Koboshi is depicted as a very assertive character. She loves Kotarou greatly but is too embarrassed to confess her feelings to him. She enjoys having a normal, routinely basis of her every day life; from meeting Kotarou in the morning to talking to him during the day, until Misha showed up. Koboshi wears cat-shaped ears on her head every day, but they are not real or attached to her. She is liable to get angry and be very overprotective, causing her to be constantly irritated by Misha's childish antics and attachment to "her Kotarou-chan".