Rengoku can bear a lot. His death that is just around the corner. The deal he had to make with the demon he should have killed long time ago. Even the fact that the desire to kill this demon has transformed into something else, something inexcusable for any demon slayer. The only thing Rengoku cannot put up with is losing his way. As long as he can breathe, he will continue to follow it.

AU where Pillars are able to heal demons and turn them back into humans. At least most of them. Or maybe all of them with only one exception. Rengoku Kyojuro was lucky enough to meet that exception.