Recs if you like Oh! My Useless Goddess! (Konosuba: God's Blessing on This Wonderful World! Light Novel, #1)...

Shorter books (under 200 pages) that are part of at least one quest. Many are also in the public domain, making them easily accessible when you want to grind for that next badge.

Volume ones only.

Series that show as manga: Magic Maker Reincarnated as a sword

To be added: