Wait usually contracts are void if the party coerced into agreeing to it, especially when magic is involved. I also hope that the MC won't be a thirsty teenager and just goes along with any beauty that asks him to die for them over and over again.
Well that's more or less the extent of my usefulness if I were in another world. Unless I could defeat the demon Lord in a trivia contest or a structured debate. Although I wouldn't be desperate enough to touch a boob (through clothing and presumably armor no less) that I'd sign an unknown contract in blood. That's shounen protagonists for you though.
Yeah but he's no less of a scrub than he was on Earth, because he still isn't a god and can't give away cheats like Oprah gives away gifts under her audience's seats.