Your Dad Is Here!

Blurb: Die was bound to a System, whose main goal was to make him out to be a benevolent father helping helpless children. But he didn't know the System had made a mistake in its assessment. Seeing all those people who wore the aura of the weak but were actually ridiculously powerful, he rushed up to them eagerly. "Don't worry! Daddy's here!" In the Demon Slayer world, Muzan is the kid. Die: "Well, you're older than me, you've been around longer, and you dare to insult me, but your dad will always be your dad." In the Jujutsu Kaisen world, Geto is the kid. Die: "What do you mean humans are monkeys? You want to kill me, too? You unfilial brat, your dad will teach you how to behave!" Then one day in the future, after Die had won the kids over with fatherly love, the System told him: "Sorry, dear, the assessment was wrong. How about we start over?" Die immediately packed his bags, ready to restart and go through the timeline again. But the children he'd won over with fatherly love came back with their memories intact, surrounded him right at his starting point, and swore to take back everything they'd lost. Die: "Hahaha, System, did you see that? Even if we start over, the kids still remember me. I knew I was a pretty good father!" The idea came from a conversation in 2020. I'll flesh it out more later. Theme: Daddy's here