Hinata Kagura

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Hinata Kagura (神楽 ひなた, Kagura Hinata?)
Voiced by: Ryōko Tanaka
Hinata is the granddaughter of the village headman, and is one of the rich members of town. She is in Takuma's class and is the council president for her class. She has a kind of obliging personality, and is popular in her school. She tends to fall down and be clumsy, and once she even fell down a flight of stairs at school, though luckily Takuma was there to break her fall. She refers to Takuma as "Hirose-sama", a very polite form of expression. Her real name is actually Hotaru Kagura (神楽 ほたる, Kagura Hotaru?), the younger sister to Hinata — known as Otoha by Takuma. When Hinata drowned, her grandfather forced Hotaru to become Hinata, and made the village people think that it was Hotaru that drowned.

http://en.wikipedia.org/wiki/H2O:_Footprints_in_the_Sand