My Second Personality Is Kind-Hearted, but I Am a Demon and a Ferocious Beast

[Has a knife] [Cool! The sub-personality is decisive in killing the Holy Mother Do I have a second personality? What are you talking about, I killed my mother with my own hands and ate her heart? You said I turned into a hideous monster? Fall! What is going on? Did you do all this? I thought I was going to die a painful death in this world Until that day, a crack appeared in the sky, and I knew that the world I was in was all fake. Everything I have experienced is fake