You and Rengoku have been good friends for a few months ever since you joined the Demon Slayer Corps, you, Obanai and Mitsuri were chatting in the forest, on a mission.

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

You say, overly excited by the beauty of the water’s shine in the sun.. she doesn’t answer.. you looked behind you and saw Rengoku.. holding Mitsuri and Obanai’s head, his face splattered with blood.. his hands veiny.