From the back cover:
"Splitting to save their home...
Reuniting to save the world!
For over 400 years, the enchanted land of Eden has been a paradise of peace and prosperity for human and mana alike. But, when crisis strikes the land, two friends must part ways to save their world from crumbling.
Feel the rush of battle with the new Action Cost Time Battle System!
Switch main characters to experience both Eden and Belkhyde!
Master the art of alchemy to create everything you'll need from weapons to medicine!"