I have difficulties with unlocking Mukuro (the japanese cursed doll). (While having never killed any demon and still being in the pacifist run), I do chapter 2.2, I beat Mukuro, I get the human key, then go take the "Memento (abyss)". I continue to the next chapter (2.3) and unlock the underground for hell where the crazy scientist girl unlock the machine o use mementos. I use the machine and watch the past of Muruko's brother (in summary I read the memento (abyss). Then I save and go do the whole chapter 2 again and again , but I never find the twins which caused Muruko to die. What am I supposed to do? Am I doing something wrong (surely) ? Please help me ^^'