Doukyuusei no Osananajimi ni Ero Doujin Mitai na Koto Suru. The Motion Anime

Summer holidays have come, but the main character cannot relax. Every day, his childhood friend Rin, who lives in the apartment next door, hangs out in his room. She lies on his bed and reads his manga all day long, periodically asking him to run over to buy something from the store. One day, the hero went for ice cream and returned home to find Rin sleeping. He suddenly had a strange idea...