For one, you don't create your own characters in this game. Instead as you progress, new girls join your team about every chapter of the game and each of them have their own classes available and you build your party around it. Speaking of classes, there are tons of them as there are five base classes that split into a large class tree. From the first class it splits into two, and from those it splits into another two.
For example here is the fighter class tree from this wiki
Gameplay is standard dungeon crawler RPG fare, explore dungeons, find treasure, fill maps, random encounters, trap floors etc. In battle each character takes turns like your normal RPG instead of the usual your team then enemy team turn orders most dungeon crawlers take like Etrian Odyssey. The battles flow pretty fast from what I've played and aren't as slow or as difficult as many dungeon crawlers usually are.
I happened across a sale on the Limited Edition premium box set for the game shortly after reading the article at yesasia.com. From their full retail price of $128.99 to just $79.99 I took the opportunity to snag it up for myself. Consider myself lucky :P
The premium box set includes a cardboard box that holds inside the game, a deck of playing cards decorated with some of the monsters from the game, a artbook, soundtrack, and drama CD. I was also lucky to still receive the pre-order bonus that I guess yesasia had leftovers of which include a PSP skin and a PSN code for a PSP custom theme.
The game was released in Japan in March 28 2013 and is rated for 17+.
Developed by Aquaplus, Game Website