RPG Idea:

You are a librarian attempting to collect books in a cozy fantasy post-apocalypse setting. Gameplay is split between library management and book acquisition.

In Library Management mode, I imagine it plays sorta like the Atelier or "dungeon shop" games, where you're placing shelves and displays and filling those with books. There are different passive bonuses for things like completing sets or putting out themed displays, and in-game missions/quests that require you find certain books for the townspeople. You might even have to occasionally track down overdue books.