They made a mistake announcing this so early with so little information. They gave fans the opportunity to decide what they think a SMT x Fire Emblem crossover should be, and whatever they imagined is almost definitely cooler to them than whatever the reality is. I didn't really let my imagination wander cause I think crossovers are dumb, but this is still pretty far from what I expected. My perception of SMT is that it's really dark, am I wrong about that? This has upbeat high pitched jpop, it's bright and colorful, it has happy anime people, and fanservicey outfits. Also I don't really see any Fire Emblem stuff in here except like weapons, and a pegasus.
I guess I wasn't really interested in the idea of bringing the characters from either series together, so I feel like whatever this is has more potential than what early reports suggested. But this trailer looks like an anime I don't want to watch. Hopefully the gameplay's good at least?