The Infinite World That Begins with Ghosts and Beasts

I, Li Shi, am a time traveler from the Celestial Dynasty. I, Li Shi, am a Japanese high school student. I, Li Shi, am an American homeless man. Before I traveled through time, I, Li Yi, learned a skill in a weird and mysterious prison, and later became a first-rate killer. So why is the shadow demon who is the number one killer, in my opinion, a third-rate killer? After time travel, the family next door is named Qiuyue? There is a brother and sister downstairs named Kasugano? There is a hospital in the city called St. Juliana? Moreover, it seems that the mother of the original body received some super ghostly training for him? What a ghost world is this! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.