The red-headed Chiharu is considered one of the most attractive girls at Zashono Academy. Her breasts initially measures at 88cm (F-cup) and progresses throughout the series to beyond 100cm.

She's shy around boys, because she came from an all-girls school. Densuke tripped on a banana peel and landed hands-first on Chiharu's chest the first time they met. Kirika later finds out that her fondness for Densuke stems from this encounter, as he was the first boy to manage to touch her huge bust.

Like Densuke, she's a recent member of the mysterious Eiken Club and always finds Densuke falling onto her bosom or stumbling upon her while she's undressing one way or another (accidentally, or one of Kirika's own brand of practical jokes), yet she doesn't seem to hold anything against him for it, and also has feelings for him.

Because of the enormous size of her breasts, they are very sensitive, and when they are forcefully touched or squeezed Chiharu appears to be overcome by the sensation. Due to the sheer size of her breasts, she is occasionally forced to wear bras several sizes too small for her, which sometimes leads to her breasts popping out of them.

She reveals in later chapters of the manga that she is happiest when Densuke is "near her," literally sandwiched him between her huge breasts.