Attachable type

There are two types of attachable type: Shoe-bound items and User-bound items.

Shoe-bound items can only be attached to shoes and cannot be removed once equipped. However, they can be replaced with other items. Equipping a shoe-bound item incurs a cost.

User-bound items, once bound to a user, cannot be removed. It is not possible to register duplicate user-bound items, and there is no cost involved when registering an item. However, equipping a user-bound item incurs a cost