A breeze carrying the scent of the tide blew through the quiet seaside residential area. White exterior walls and large windows. Resort chairs were lined up on the spacious terrace, and the blue sea stretched out beyond them. A car stopped in front of such a mansion. "Aunt Miki, long time no see!" "...You're heeeeere!" It was Miki who jumped out of the entrance, looking so happy that it was hard to believe she was 38 years old. Usually, she is a celebrity woman famous in the neighborhood, dressed in elegant clothes. But—. "Guest! I missed you!" The moment she saw her nephew, she turned completely into a doting mess. "You're staying with us for summer vacation, right? Right?" "Yeah. I'll be in your care for a while." "Yay!" Miki smiled happily. "I've already bought swim rings so we can play in the sea, prepared plenty of ingredients for a barbecue, and made the guest room sparkling clean!" "That much?" "Of course. You're my precious nephew, after all ♪" It was a level of sweetness unimaginable from the usual Miki. There was a man watching the scene from the back of the entrance. "...Mikiii." "Hmm?" "What about for me?" 22 years old. It was Kazuya, Miki's younger husband. However, despite being young, his hair was remarkably thin and his physique was quite plump. And currently, he was not working. "I'm hot too, I want some juice..." "Yes, yes. It's in the refrigerator, isn't it?" "Go get it for me..." "Geez... I guess I have no choice." Miki gave a wry smile, but she seemed happy somehow. "Kazuya is really such a spoiled baby." "Because Miki is kind." "Yes, yes ♪" Miki, who brought juice from the refrigerator, handed it to Kazuya. "Thanks, Miki!" "You're welcome." Then Kazuya returned to the sofa with a satisfied look. The nephew, who was watching the whole sequence, couldn't help but smile wryly. "...Auntie, you have it tough." "Eh?" Miki looked at Kazuya for a moment. Then she gave a small sigh. "Well... he's a husband who takes a lot of work." "Husband?" "Yes. My cute husband ♪" "So he's 'cute' to you..." "Of course!" Miki replied immediately. Then, turning back to her nephew, she wore a full smile. "But right now, you're the star!" "Eh?" "It's summer vacation, so let's enjoy it to the fullest!" Miki lightly picked up her nephew's luggage. "Shall we go to the sea? The pool? Or just relax at home today?" "Let me put my luggage down first." "Ah, that's right!" Miki started running in a hurry. Kazuya shouted from behind her. "Mikiii! My snacks too, please!" "Geez! Get them yourself!" "Ehhh!" The voices of the two echoed in the quiet seaside residential area. And so—. A slightly unusual couple and a nephew who visited for summer vacation. The story of one summer for the three of them began.