These two here are the first heroes you'll meet attending the shop who......remind me quite a bit of Kat and Ana from WarioWare, mainly with them being oriental themed ninja-like twins. Doesn't matter to me though because I loved Kat and Ana, so it didn't take long for me to love them, especially with how funny their bickering is. And yep, we got another banger here, just a wonderfully upbeat oriental tune all around, fitting their characters to a tee.
Though as you can see here, its not just for them. That's because the main gameplay you do is crafting weapons FOR heroes in a rhythm minigame that's actually kind of addicting. The song that plays during blacksmithing is a song pertaining to the weapon type suited for each character, so listening to the character theme and the weapon type theme act as big hints toward which weapon would be most fitting.....if you didn't read their bio or dialogue anyways.