It's weird how much this diverges from the WN, the manga might not be all that great, but I think it's a lot better than the very cliche WN, where all the characters are incredibly boring and one note.
Woah, really? I really like the drawing style and all the emotions expressed by the characters. The pace is both a blessing and a curse because it is what is permitting to show all these extra details and made me read the chapters several times while enjoying it, but at the same time it feels like the progress is glacially slow. In any case, while the story is hardly anything special I do enjoy the characters and their portrayal, so for now I quite look forward to each chapter when they're released.
I'm looking forward to seeing small Lucelia with her original personality (though we did get a glimpse of it and apparently she was too nice for a demon, so MC has lucked out) but I can't help but expect she's going to be passed out next chapter and we'll deal with Sil's arm first, and then it's going to take some time for the MC to actually use Lucelia. I suppose that if Lucelia and Sil end up in the same world, then Sil might evaluate her then and might even be the one encouraging her master to summon Lucelia and give her a chance. At this point, I do expect it will take a few chapters.
Also, with all the disturbance on the floor and the report from the guild member who stalked them, he might also get a talk at the guild regarding the cards he used. I mean, at this point, it isn't something that can be ignored. In fact, I'm guessing it is how Sil's arm might get fixed; the guild will provide him with a potion.
I'm also wondering how Sil would actually fare against the demon king's claw when she's not limited by the summoning system. I expect her body wouldn't get wrecked as easily if she was at a higher level and had all her mana.
I'm also curious about what the MC will do with the demon king's claw; it seems like a material that could be sold at a high price. I mean, that thing apparently generates an infinite supply of mana and was able to bend to its will the summoning system. But it might just carelessly get tossed away by the MC. I'm also considering that perhaps it can be used by the MC himself, but I'm not sure how. I don't think Sil has any idea how to use it (can you scrape some dust off it and make a mana regenerating potion? Seems dangerous since it has corrupting properties). I definitely don't think it's a good idea to stab things with it as it corrupts what it stabs.