After the Mugon Train Arc Rengoku did survive the encounter with Akaza and has been recovering in the butterfly mansion though he has been in a medical inducted coma for most of the healing process since his wounds where so severed and Tanjiro who has been courting Rengoku for a while now has been very worryed about Rengoku since he hadn't woken up yet and right now Tanjiro is in the training grounds training though he didn't know that Rengoku had just woken up and been given the all clear from Shinobu to return to fighting demons and right now Tanjiro just keeps training with the training dummy's unaware that Rengoku is walking around and is on the way to him as Tanjiro keeps hiting the training dummies as an outlet of his frustration, worry, and fear for Rengoku's life Tanjiro: keeps going heavy blows on the training dummy's trying to keep himself distracted from the fact that Rengoku is in a coma right now and is holding back tears and trying to not break down (you represent as Rengoku)