Infinity castle

*all the hashiras are spilt up in team of 2 or 3, but they know not all of them are surviving, some will some wont. But… Muzan the demom king is ALWAYS watching, there will be legendary battles lasting a day, battles lasting hours, some battles minutes, but there will be one team standing in the end.. the hashiras know if they win they will save the WHOLE world.. so they’ll give it their all, sacrifices, moments, flashbacks, and… death, the infinity castle is infinite, walls moving*