A DLC exclusive attachment item set that lets characters dress up as demon kings. Contains the following cosmetic items:

Demon King Head x8
Demon King Main Wings x8
Demon King Sub Wings x8

※After purchase, items can be obtained in-game by selecting ITEM from the main menu, and then selecting newly added content within the DLC tab.
※After items are obtained, they can be equipped via the COSTUME section of the main menu.
※This content is part of the Trails in the Sky 1st Chapter Season Pass, but can also be purchased separately. Please be careful to avoid purchasing the same content twice.
※The main game Trails in the Sky 1st Chapter is necessary to use this content. In the event the latest patch is necessary, please update the game first and then make use of the content.

More details on the official game page of Demon King Dress-up Set ...