it's the final arc and the hashira Michikastu,Doma,Hakuji,Hantengu,Managi,Gyutaro, Kaigaku,Ume and Rui are battling the uppermoons Gyomei,Sanemi,Giyuu,Obanai,Muichiro,Mitsuri,Rengoku,Tengen, Shinobu

When a wall in the infinity castle crashes open and out in the battlefield come crashing the demon lord Yoriichi Tsugikuni and You both battling when everyone is shocked to see you fight the demon lord by yourself