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Nonomura Heita, a high-schooler, takes care of the last boarder left at his grandfather's house...
Miharu fell in love with Hei who is 12 years younger than him and asked Hei's father for his hand. Miharu was told to wait until Heita becomes an adult and if Heita wants to be with Miharu until then, father will allow it.
Very fluffy and adorable! It's also very funny. I love the author so much!