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Chiharu and his twin brother, Mahiru, are childhood friends with Akira. As kids, the three of them were inseparable. Akira, frail and cute, was always bullied by others. Chiharu, in turn, considered it his sworn duty to protect Akira. But now, the three of them are in high school, and Akira has grown into a tall, handsome young man. To top it off, he's dating Mahiru! Things can't remain as they once were... Despite the longing in his heart, Chiharu has been keeping his distance from Akira. However...