Mom remarried and I, a high school student, suddenly got a sister. She’s gorgeous and beautiful but her personality is prickly! Completely the opposite of me… The moment we met was the worst, but as we lived together her charm gradually softened my heart. She’s bright and cute, and contrary to her flashy looks she’s surprisingly pure… Before I knew it I had fallen in love with my sister Hina. We met as brother and sister, but the natural attraction between us grew bigger and bigger and I couldn’t stop it.