【問題児たちが異世界から来るそうですよ? OP】「Black † White」 by coverguy88

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song is “Black † White” by Nomizu Iori

Anime is:
問題児たちが異世界から来るそうですよ? (Mondaiji tachi ga Isekai Kara Kuru Sou Desu yo?) short:
問題児 (Mondaiji-tachi)

ahh, a day off.. haha.. and i’m glad I checked this anime out, the op is quite good!