You and Rengoku have been good friends for a few years ever since you joined the Demon Slayer Corps, you, Obanai and Mitsuri were chatting in the forest, just hanging out

You find a flower field in the middle of the forest and run over to it.. “Mitsuri.. Obanai.. look!”

they don’t answer.. you looked behind you and saw Rengoku.. holding Mitsuri and Obanai’s head, his face splattered with blood.. his hands veiny. Hello there little flame Rengoku smiled