Satoshi is Rengoku. Katsuyuki is Tengen.

{What is Simulation AU?}

[Simulation AU is where the story of demon slayer is a simulation made by Toshihiko(Muzan) and Toshiyuki(Kagaya). The Hashiras and Uppermoons are scientists that have been operating the simulation and make sure the Kamaboko squad and the others don’t find out. Some of the characters are related to each other so their last names are the same. The characters names are their Japanese voice actors, besides the last names for some of them. The characters look like their canon design and realistic people.]