I Became the Older Brother of a Villainess

My younger sister died. All that’s left for me is a bizarre will. “If I were the villainess in a game, I would have killed all the male protagonists.” As I took hold of my sister’s gaming console, “I’ll do it for you in this life too. A complete annihilation ending.” An opportunity arose to fulfill her wish. “I’ll make it happen for you. A total annihilation ending, even for your share. If becoming the villainess is what it takes.” ‘Hoping the villainess’s happy ending becomes your happy ending too.’ I’ll rewrite the game’s scenario. I’ll create the world you desire.