Himari often doesn't wear a bra at home. Her brother isn't sure whether it's because she dislikes the tightness or simply wants to relax. As her older brother, he's recently found most of his worries centering around this habit of hers. Even though they're family, constantly seeing his teenage sister like this is taking a toll on both his mind and body. The more he tries to ignore it, the more he finds himself having forbidden thoughts. He doesn't know what to do with these feelings, and it leaves him deeply conflicted.