Black Cat Book Club customisation covers fur patterns, eye colours, accessories, magical artifacts, and library decorations. The Steam store description does not document a branching narrative; the choices the player makes are about how their cat and library look rather than how a multi-ending plot resolves.

Cat customisation

The cat's fur pattern and eye colour are configurable from the start. Accessories and magical artifacts can be unlocked as the cat reads more tomes and decodes more glyphs. There is no separate Black Cat Book Club endings route — choices in community discussion map to customisation, not to a multi-ending plot.

Library decorations

The library itself can be decorated with magical artifacts and ornaments earned through spell progression. Decorations change the look of the library but do not alter gameplay mechanics.