Hacks.

All you need to do is get reincarnated and you get all the benefits of the curse with none of the drawbacks.

Create a chain of monsters consuming the souls of the next monster's owner. Then every monster's contract is fulfilled, but then the last guy in the loop kills the first guy, the one still wielding his soul. Then he reincarnates because of reasons, but his ghost doesn't follow him back in time. Then find the scientist guy and rinse and repeat, over and over. The cursed people didn't follow you, so they never suffered to begin with! Wahaha! Min-Max yourself in hyper-magic, then when you reincarnate the last time, you never need to rely on the curse to begin with. It's the perfect tunable groundhog-day boson laser as-a-person!

@Angibot Actually 15~20*

Farenna = waifu

@Angibot Theoretically, the soul contains the memories and emotion and was carried over from the previous life, but the brain where thinking occurs isn’t fully developed since the body is still that of a child. Therefore, it makes sense to act as a person of that age

the guy is supposed to be mentally 30yo and act like a 10yo.
This is why reincarnation as a kid is always stupid.

And the contract was formed... but why is it still in effect now???

no john you are the demons