Danshikousei-teki Kazoku Keikaku!

Hino-kun is a good-looking high school student mistakenly thought to be a delinquent. He is caring and responsible, especially for his young nephew. He notices Mizusawa-kun has a talent for baking and, wanting what's best for his nephew, proposes that Mizusawa marry his older sister. Unexpectedly, Mizusawa instead proposes to Hino directly.