Aquapazza is a mashup of characters, most of which have never been seen outside of Japan. The Tears to Tiara crew come from one of Leaf’s tactical RPG.
Arawn, the sword wielding dude, is the protagonist and slayer of a demon king. He rescues Riannon who was sacrifice for the demon summoning ritual. Riannon falls for Arawn head over heels and becomes his first wife. Morgan, the archer in the beginning of the video, is Arawn’s second wife. Arawn actually has more wives just in case Aquaplus ever makes a sequel to Aquapazza. I suppose they could throw some characters from Tears to Tiara II in there as well.
Aquapazza comes out next week in North America.