Purchase the NieR: Automata™ Day One Edition for a limited time only and receive the 'Valve Character Accessory' as exclusive digital bonus content.
The NieR: Automata™ Day One Edition includes the following bonus content:
Cardboard Pod Skin
Retro Grey Pod Skin
Retro Red Pod Skin
Grimoire Weiss Pod
Machine Mask Accessory
http://store.steampowered.com/app/524220/