Demon Slayer of Time and Space

[Infinite flow of copies of all heavens] [Mysterious side of Ragnarok] ——————————————— rainy night, A dark shadow knocked on the door of the orphanage, I watched the staff come out and leave in a hurry. A newborn baby was abandoned in front of the gate and cried loudly. The teacher who rushed over hurriedly picked up the baby and looked around and shouted in the heavy rain. There was no one around, so I could only take the child back into the house, tidy up the wet hair, and look through the light. Inside the baby's swaddling clothes was a pair of unopened black playing cards. On the cover, there was a drawing of a clown with a very mocking expression. Below it were written five English letters in large bleeding letters: Joker