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Natsuo Sannami, whose appearance and educational background are no match for his older brother Masaki. Natsuo, who is dull, secretly fell in love with Masaki's girlfriend, Manami, without telling her brother. One day, Manami was supposed to be a tutor by Masaki's plan, and it came to mind ... However, just before that, it is heard that Masaki and Manami got engaged. I want to congratulate them on their happiness, but the pant voice of Manami leaking from my brother's room swells with a nasty delusion.