The light novels and manga of A Nobody’s Way Up to an Exploration Hero haven’t been licensed, but I was curious enough about the source material to check out the available scanlated chapters of the webnovel and the manga.
The webnovel is pretty similar to the anime. Crush-chan’s missing daddy hasn’t been mentioned at all (at least up to the arrival of Our Shota Devil Chibi), so she doesn’t scold Our Hero constantly for going into the dungeon, which is refreshing. She does bully him into dates and go sub-zero when she finds out about Our Hot Naginata Gal and friends, but otherwise she’s been a very minor character so far. His two friends have a bigger role, getting back into dungeoneering and leveling up rapidly.
The manga is very different. First off, Our Busty Guild Gal is not only fan-service-enabled, she’s keeping a very close eye on Our Hero, including sending a spy into the dungeon to discover his secrets (because of course she’s more than she seems). Second, he takes Our Chibi Valkyrie’s card home with him and gets to sleep-visit her in her world, where she’s full-sized. Third, Our Chibi Demon Gal’s intro is completely different, with her initially showing up as full-sized fan-service with a vicious streak. Fourth, Crush-chan hasn’t even wandered over to say hello yet, but he’s already had a meet-cute in the dungeon with Our Hot Naginata Gal. Fifth, in her own world, Sylphy has a hot twintailed dark-elf maid (Luceria is living in a tree, and not in a good way).
Oh, and chibi Sylphy has huge barely-restrained boobs.
(and, yes, the safe behind his bed actually makes sense in the manga, because he stores the servant cards in it)
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