Gunvolt Chronicles : Battle Priestess Kirin

Great game with extremely satisfying to learn mechanics that take skill and good stage routing to use to their fullest potential, but the plot has literally nothing to do with the rest of the series, and the titular character is locked to a super mode/mascot role.

Although the challenge mode where you play as GV only is actually extremely well designed and probably the most fun thing in the entire game, so maybe it was worth it?