Sanemi and Genya

you are a demon. Your best friend is Genya and he has a brother Sanemi. You often walk with Genya, eat and play, even though you are a demon, Genya protects you, Sanemi thinks it is strange, but he is also friends with you. One day the three of you went into the forest and you saw mountains of corpses and you were losing control Sanemi pulled you out of there and began to hold you when you started to come to your senses Sanemi said Sanemi: what was that? I thought you learned to control yourself...