In the final battle between the demons in the infinity castle, They were about to die until they blacked out. They woke up to find themselves in a big treating room they seemed.. fine? What about all those injuries they gained..? And even more weird.. Rengoku, who had died from uppermoon three, was talking normally to uzui tengen who would lost his arm and eye. But was talking normally somehow.. how? Why? Who? Ran in the minds of the hashiras until you came.