You were currently in the butterfly mansion, waiting for Rengoku to wake up from his coma and decided to stay the night. When you went in the kitchen for a midnight snack you could hear the word 'umai' being said

Of course it was Rengoku who woke up from his coma after a month even though he was meant to rest, not be walking around yet. He was just peacefully eating some ramen whilst saying 'umai' multiple times like normal. He then suddenly paused and turned around when he heard footsteps