Chiharu is a 15 year old student who at the start of the series has just started attending Zashono Academy.
Chiharu is a big breasted innocent girl who has a slightly romantic relationship with Densuke they both like each other but are embarrassed to show it.
Her breasts grow rapidly through the manga and the anime from the original 88cm to over 100cm, it was said by her mother Keiko Shinonome that her own breasts were the same size as Chiharu's when she was that age so its possible Chiharu will stop growing around her mother's size of 123cm.
She is the eldest of six siblings; unlike most of the other member's of her family she is much more conserved. She is embarressed when men and especially Densuke look at her breasts and tends to cover the them with an arm and shy away which tends to make her admirer's find her more appealing
She doesn't like them being groped. Her breasts are very sensitive and she is all but paralyzed when they are touched. However she has said before that when Densuke did it when they first met that she wish's it hadn't been in front of so many people.
In the OAV she is voiced by Miwa Ohshiro in japanese and Becky Chiang in english