This was... certainly a first chapter. To be perfectly honest, I had very few expectations for this series besides being a way to maybe kill time, but I don't think I could even continue reading it just for that either after this sort of introduction. Typical expulsion opening except... it makes even less sense than usual.
Spoiler warning for if you haven't read any of the dozens of party-expulsion manga that've been popping up like crazy over the past couple of years, but if you've read one before, it follows the exact formula to a T.
Immediately after he's expelled for being useless, the MC proceeds to cleave a wyvern in half from their head to their tail, take potshots on demons and hit them in the eyes while freefalling like his name is Clint Barton, and despite being able to do all sorts of damage to them including cutting one of their arms off, apparently can't kill them because he "doesn't have a skill" (this world's shtick). Aside from that being the easiest fix imaginable with him just leaving the finishing blows to people who have them, he's apparently useless because of this, and instead of just letting him be a rogue-type supporter in the heavily unbalanced party of a sword saint, tank, sage, and... self-defense expert... they kick him to the curb, where he immediately finds the god-tier power-up the world told him he'd get if he just encountered a certain monster. And that monster just so happens to be a demon king (female, for unfortunate reasons that are quite apparent her very first appearance), who he stumbles upon in the middle of a massive abandoned castle that for some reason went completely unnoticed and unguarded by humanity despite him walking to it in the span of a few hours at most from a busy town.
I'm kind of surprised at the quality of this one considering the decent level of skill that went into the author's other series (Yuusha to Yobareta Nochi ni: Soshite Musou Otoko wa Kazoku wo Tsukuru), but this could've very well been an earlier attempt at writing, and for that I'd give it a pass. That said though, I'd also have to pass on continuing to read this series for now, since I'm fairly certain I could already predict the ending with how cookie-cutter this chapter has been.