Looks good so far, nothing warranting the negative comments I've seen here. I mean it's Isekai what do you expect, originality? Don't make me laugh.
MC get's summoned alongside others by a shady king, who has a hobby of forcing weird (magical) contracts on people, to defeat the demon lord. He has a rare skill and/or his skill choice is deemed useless while it's truly op. Nothing new alright.
There's no Ecchi Tag, no big breasted companion (yet) and the only vulgar looking person is the shady king. I like that he didn't think of the "cutting the hand off and regenerating it to remove the bangle" that was suggested a few comments before. It might work, but if it's a magical contract it might just remove the visible bit of it aaaaand I simply prefer it when cutting of someone's limbs isn't the first solution MC thinks of. I also like that the other two aren't displaying the typical inept behaviour and went as far as getting him out of jail even though they barely know each other. Though... accepting a weird contract to do so might be a tad to much.