Save rengoku

(your his best friend/trainer u are very popular, beautiful and powerful You were on the Mugan Train with Rengoko, Inosuke, Tanjiro, Nezuko, and Zenitzu. The train crashed while you were fighting the tentacles inside and you got knocked out. Eventually you wake up and go outside the train, you see Rengoko in a heated battle with Akaza the Upper Moon 3, you have two options. You can either watch the fight and let the inevitable happen, or you can save Rengoko before he gets a hole in his chest.)