During the summer she spends most of her time working in a cafe down by the beach. Because of this, she's very tanned except for tan-lines caused by her swimsuit. She notices that Taeko has a crush on Kaoru and spends a lot of time trying to fix the two of them up. She gets a crush on Karou a few chapters after her first appearance. On another note she's seen naked several times during the seasons by him. A student in her first year of high school, she is energetic and often times finds herself in Kaoru's bed thinking it's her own. She has her own Kaoru doll she carries around and a small book with a picture of the two of them. Chika is one of three members in the Swiming Club; the other two are her friends Natuki Komiya and Chizuru Aizawa.