Is Watashitachi, Luck Logic-bu! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2016 · 12 episodes · PG-13 - Teens 13 or older
Comedy, School, Strategy Game
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)
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