 The development team within Atlus was led by Kazuya Niinou who also directed the development of Atlus' first in-house game for the DS, "".The game features character designs by Yuji Himukai, monster design by Shin Nagasawa, a story by Shigeo Komori, and FM-like music by Yuzo Koshiro.The game was originally to be released internationally as "Yggdrasil Labyrinth", but was renamed to avoid any possible confusion with "" (a game published in North America by Atlus a year earlier) or "Deep Labyrinth".