Etrian Odyssey series is a hardcore classical RPG - truly - alongside from SMT series (especially the 1st person view SMT games). Millenium Girl is actually an anniversary version of EO series, with adding story and stuff. Hardcore difficulty, unique skill leveling system, and the famous OST keeps this series alive.
Well, I played the 4th installment, and tried the demo of Millenium Girl. It was good but until now I still decided to buy other games instead ^^;