Iya da to Itte Moratorium

When Mitsu was in high school, he had a physical relationship with his childhood friend Nana, whom he had a crush on. However, when Nana suddenly asked him, "Do you want to stop doing this kind of thing?" Mitsu was unable to tell him that he didn't like it, and ended up heartbroken. Mitsu has not been in contact with Nana since then, but his...