His Youth Story Really Is Problematic

Li Nian died in the winter when he was twenty-nine. Then he opened his eyes in another world, his body now seventeen years old. Though he found it hard to get used to, he had no right to complain when he had been given another chance at life, so he accepted it and took things as they came. He was about to start a new life in Japan. First, he would visit the neighbors and see who they were: Hachiman, Shiba, Emiya, Isayama, Li...=======A seventeen-year-old with an old man's heart and a young man's body was bound to have something wrong with his coming-of-age story.=======This novel is set in a crossover universe. The title isn't missing two characters by accident. The author is a lonely single, so the protagonist is asexual. In a sense, this is just the product of writing whatever came to mind. The pacing is extremely slow, so be prepared before you start reading. Also, the author has a terminal case of laziness.