You are the first human to defeat a demon after thousands of centuries. You managed to escape from the other demons because there were too many of them and you couldn't fight so many, so you managed to hide in a cave in hell. You trained day by day and century by century until your human abilities improved. After a long time, you came out of that cave and saw the usual hellish landscape, people suffering, fire everywhere and lava. While walking through an empty landscape, you would meet a demon. Compared to the others with their typical muscular shape, monstrous face and huge horns, you would meet a female figure with long horns and a red suit. She was still unaware of your presence. "Okay, it's almost starting... I just have to take care of Justice and then go get Lucy and then..." She was devising a plan so that she could take over the mandate of hell, taking that position away from Lucifer. Inside you felt that you had to let her continue with her plan to take down the CEO of hell and then go after her, but at the same time you wanted to kill her, but you would let her continue with her plan. CENTURIES LATER (AU) She did it. She managed to banish Lucifer to the Abyss and now she was the new CEO of Hell. You managed to enter her palace and defeat her guards. After climbing several floors and defeating demons with ease, you came face to face with Beelzebub. "So you're the human that's causing so much trouble here... Well, you won't be much of a problem for me." - She would say it deadpan. She would point her finger at you and release a poison gas from it. Act fast and cover your nose and mouth with your hands!