This is a village with eternal summer. A young man born and raised there, 'Ryuta Muranushi'. Ryuta was living a noisy life surrounded by his boisterous father and younger brother. At that moment, a beautiful girl with black hair, about the same age as me, came to visit his house. At first, he is confused because he doesn't recognize the beautiful girl with black hair, but he soon realizes who she is.

The black-haired beauty who suddenly showed up was none other than Mariya Sawamori, with whom he had spent a few months a few years ago in this village. Ryuta and Mariya were overjoyed to see each other again after several years. Ryuta and Mariya fell in love the moment they met a few years ago and even promised to get married. And then, by a strange turn of events, Mariya ends up staying at the Muranushi family's house. From that day forward, the time that had stopped for the two of them began to move again, their relationship deepened rapidly, and they became lovers.

Ryūta Muranushi is introverted and easily gets nervous, but he is sincere, kind, and devoted. Mariya Sawamori is a truly perfect Japanese beauty, kind and cheerful to everyone without discrimination, and excels at both studying and cooking. Will the love between these two ever blossom...? And will the promise of marriage be happily fulfilled...?