I haven't been able to keep up with Umi-chan lately, but to find out that she's going to be in a fighting game is pretty nice. Further, the fact that she drops a giant tadpole on her opponents? Day one purchase right here.
What I'm especially curious about will be the mechanics. The real test will be sitting down with it and the balancing as well. I never got to play Blade Arcus, but it looks like an upgraded version of that. Which should be quite nice, since Blade Arcus was their first fighting game and while the attention to that one was minimal the response was quite positive overall.
However, what I'm really excited about is this exposes a whole new demographic to Umihara Kawase. When it comes to a mashup, you'll get people looking into where characters are from and this could be a great opportunity to potentially draw in new eyes.
Only time will tell how it does, but with a PS4, Switch, and PC release planned it's going to definitely have a good opportunity to get a few eyes on the game itself.