The younger cousin of Taeko Minazuki.
Chika is the middle school aged cousin of Taeko who lives at a beach house. During the summer, she mostly works at a cafe along the beach and as a result, her body is tanned alongside areas where she wears bathing suits. An energetic girl, Chika attempts to try hooking Taeko up with Kaoru during their stay at her beach house and she later becomes a resident of the Western style home. She makes friends with two girls at her middle school, Chizuru and Natsuki, and becomes a part of the school swimming team. She looks up to Kaoru as an older brother figure, though there are hints that she may have deeper feelings for the young man.