I've really liked this OP since the first time I saw/heard it. The Anime that it belongs to, titled Mondaiji-tachi ga Isekai kara Kuru Sou Desu yo? (aka. Problem children are coming from another world, aren't they? - Quite the mouth full, eh?) was equally pretty damn great right up until its finale. Don't get me wrong; the finale was pretty good too. It just felt like the ending of an arc, not the closing of a 12 episode "series".
One can only hope that Problem Children receives a second season at some point because it desperately needs one in order to feel complete, and I can't get enough of the (Mary Sue) protagonist trio. x3
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