NEKOPARA Vol. 2 had Steam trading card support added on 22 February 2016. 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. 1, NEKOPARA Vol. 3, NEKOPARA OVA and NEKOPARA Extra, also have trading card support.
Chocola and Vanilla in Uniform
Coconut & Azuki in Uniform
Coconut & Azuki Sleeping
Chocola & Vanilla Getting Ready