Amagami SS: Tachibana Miya-hen - Imouto  

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Miya Tachibana, under the assumption that her brother Junichi would always be unlucky in love and remain single forever, decides to monitor him at school after hearing that some of her friends consider him to be kind and caring. Through her surveillance, she discovers that he has a good rapport with girls at school, leading to an even greater misconception on Miya's part, as she mistakenly believes he is attracted to men because he does not have a romantic partner. Nevertheless, after rejecting a boy herself, Miya begins to question her perspective on Junichi as she recalls his similar experience from two years prior.