Damn, OP! You hyped me for absolutely nothing!
How is that even remotely dark? You have the nice young girl with a dream ("Watch, Onee-san, I'll become an idol!", please....), and then monsters appear and kidnap her, and her friends get magical powers to fight the monsters. And then, we can go back to the idol/singing/friendship magical show ("I love singing!" in the supposedly dark part of the trailer...). That's not even Naruto's level of dark side, it's barely Shonen/Shojo 101 ^^ (it's exactly like the preview for next week episode of any "Friends kill monsters" generic shonen).
Yes, it's not SMT, I know. It's not Persona 5 either, I know. But I don't understand how anyone can say "dark side", "it all goes to shit", "BAM" for a trailer like that... 10 seconds with 3 monsters and the heroes' powers appearing do not make this trailer dark at all (you didn't think we would be fighting against monsters?).
EDIT : The second trailer does not give anything new. I like the music and Chrom's design, but the main characters and what I understand from the dialogues are just... Generic is the nicest word I can find (cringe worthy would be more appropriate for some parts).







