Tatsuya and Miyuki Shiba are brother and sister, but they share a bond that transcends mere blood relation. Despite the fact that they're siblings who attend the same school, their lot in life couldn't be more different. Miyuki's a Bloom, one of the elite students of Magic High, while Tatsuya's a Weed, with low expectations and even lower levels of respect. But having skillfully diffused a tense situation, Tatsuya finds himself recruited by the school's disciplinary committee and soon discovers there's more to Magic High than he realized.