[JUR-521] I wonder if something has changed since then. An unfaithful affair with her childhood friend, Mahiro's sister, who drowns in youth. Mahiro Ichiki

Although he moved to Tokyo for a job, he had a mental breakdown when he worked for a black company, and he had to return to his parents' house for the first time in several years. Unlike the city that was driven by a sense of impatience, the atmosphere of the peaceful countryside ... Then, suddenly, a woman called out to him. It feels like I've suddenly traveled back in time, and when I think it's someone, it's my childhood friend Mahiro sister! Is it really Mahiro's sister...? The shape has not changed at all since then. He seems to have been nearly 10 years older than me... It seems that Mahiro's sister also returned to the countryside when she got married a few years ago. Before I knew it, I was taller than her, but our relationship was the same as before, and she treated me like a child...