Manatsu no Tenkousei _One summer's memory in a small isolated island The Motion Anime

The main character of the story moves from the city to the province and meets a breathtakingly beautiful girl. People around the main character are spreading rumors about this girl. Allegedly, she has sex with everyone, even with old people. The hero does not believe the rumors and decides to sort out the situation. However, the truth revealed to him is even more shocking...