I like both the web novel and the manga. The novel is pretty long (17 Japanese LN volumes at the moment) so I expect this anime to just scratch the surface of the story (not that it has so much depth though, just a normal power fantasy).

That Takumi started to make his fortune by making washing toilets is amusing and I liked that it gave us a glimpse of the QoL of the fantasy world, but it might get him into trouble because light magic was monopolized by the church.