Kamisaka Haruhi, having been rescued by a mage when she was young, longs to be a mage herself. So she enrols into a special school that also teaches magic. Together with her rival/best friend, Hiiragi Anri, she studies magic while searching for the boy, who saved her years ago — to give him chocolate on Valentine's Day.

Source: ANN

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Side story: Happiness! Watarase Jun no Karei Naru Ichinichi - Oshimai