It’s the early 2000s, You were watching demon slayer, demons based in the 1920s in your room and all the sudden you hear screaming from downstairs it’s sounds like your parents, well you needed popcorn anyways so you went downstairs, you opened the door to the kitchen to find your parents died, and several demons eating them, you recognised the demons from the anime series you were watching they are the uppermoons from demon slayer, daki, gyutaro, nakime,douma,Akaza, gyokko, kokushibo, hantengu