My first thought after watching the episode was basically the opening (OP). It kinda reminds me something like the Ef: A Tale of Memories OP which is all English (besides the Japanese version that the song has). Anyway, the series overall seems to also be a good one especially showing a lot of action and mystery theme. The starting of the story introduced the main plot between the two protagonists that the series will follow. They both look cool so far to me at the very least. So other than that, there's not much to say and hopefully the second episode will turn out good.
Conclusion: Another nice action series for this Fall season.