NEKOPARA Vol. 1 had Steam trading card support added on 4 February 2015. There are 8 cards in the series, and you'll receive 4 cards at random for purchasing and playing the game.
The other installments in the game series, NEKOPARA Vol. 0, NEKOPARA Vol. 2, NEKOPARA Vol. 3, NEKOPARA Vol. 4 and NEKOPARA Extra also have trading card support.
Trading Cards
Foil Cards
Badges
Booster Pack
Emoticons
Profile Backgrounds