So if we talk about light novel: the second anime season ended with light novel vol 6. So u would have to start with vol 7. If we talk about the Webnovel, that’s what u find on this site, read the comment above yours (no guarantee tho). I would recommend reading the light novel, just because it’s more complete. Better Grammen, no typos, pictures now and then etc.(in general the Webnovels are raw versions and the light novel are the complete ones, with proofreading and stuff). AND I would recommend to read the whole thing, cause just like somebody already commented: the anime doesn’t do the book justice.
