@boag
I agree, but the comic version is more focused on lewds (it helps that Hyouju Issei is a NSFW artist). Considering that the story goes nowhere, if I need to chose between the boring dungeon part and sexy time, I'll diffidently pick the latter, because the novel's dungeon exploration was completely generic, tedious, and repetitive. Bed scenes were just glossed over.
In the comic version I can at least waste my time by studying Issei's erotic art and get my portion of naked waifus.