I'm not sure specifically as I haven't read this novel directly. But generally, in the isekai genre, it might be about a second summoning to another world. Maybe the protagonist has been summoned once before and now experiences a second summoning with new challenges, adventures, and character development.
Well, the title 'kumo wa desu ka light novel' is rather mysterious. It might center around a character's identity as being 'kumo' (cloud). In light novels, often there are elements of the supernatural or other - worldly. So perhaps this 'kumo' is a special being, like a spirit or a magical creature. There could be a story of this 'kumo' interacting with humans or other beings in a fictional setting, with various plot twists and turns related to its existence and purpose.
A 'raw web novel' implies that it is a novel that is in its original state as it was first published on the web. Regarding 'kumo desu ga', it could be a lot of things. It might be the name of the main character, which could be a spider or something related to the concept of 'kumo' (spider in Japanese perhaps). The plot of the novel could revolve around this 'kumo' character's journey, experiences, and growth. It may also have a complex world - building aspect, with different settings and supporting characters that interact with the 'kumo' entity. However, this is all speculation without further research or reading of the actual novel.