Naruto: Demon Brothers

"Transmigrating with a Mary Sue like you is the worst luck I've ever had!" That's what he thought.

"Transmigrating with an idiot like this is the dumbest thing I've ever done!" That was his opinion.

There was nothing they could do. That's just how the two of them ended up transmigrating. They had no choice but to stick together and become a perfect team in this dog-eat-dog world. But that kind of thing is often a sign of someone being too overpowered.

So he became a useless deadweight, dragging his teammate down.