Watashitachi, Luck Logic-bu!
Watashitachi Rakuroji-bu!
私たち、らくろじ部!
The comedy shorts follow four girls who are members of the Luck Logic Club, whose activity is playing the Luck & Logic card game. Watashitachi, Luck Logic-bu! will air approximately one minute before each episode of the main series.
(Source: MAL News)