Key items are unique objects essential for progressing the main story or completing specific sub-stories. They are usually obtained automatically through dialogue or by interacting with specific objects. They cannot be sold or discarded.
Crafting materials, on the other hand, are used at Kamiyama Works to create new weapons, upgrade existing ones, or repair damaged gear. These materials can be found in various ways:
- Locker Keys: Open lockers around Kamurocho, often containing rare materials.
- Street Drops: Enemies sometimes drop materials after being defeated.
- Mini-Games: Certain mini-games offer materials as prizes.
- Shops: Some shops sell basic crafting materials.
- Sub-stories: Completing certain sub-stories can reward you with rare materials or weapon blueprints.
Always keep an eye out for sparkling objects on the ground, as these often indicate a locker key or a valuable crafting material. Regularly visit Kamiyama Works to see what new items you can craft or upgrade with your collected materials.