I got into the Atelier series just by buying it randomly in GameStop now I’m hook. I’m on Atelier Meruru 100% but I completed every Atelier game up to date with Ryza 2 and very excited for Sophie 2. You should definitely play these games man!
Just defeat this guy today, and also Demon Lord (Blood Elemental before Ozean Kaiser as well). It took me forever and a lot of learning in the game to overcome all the secret bosses, but my God finally doing it today felt SO satisfying, and this playing as Rorona, Meruru and Totori fought Ozean Kaiser together was way too good.