スパイク・チュンソフト
The game was developed by Spike Chunsoft and Atlus, the developers of the "Mystery Dungeon" and "Etrian Odyssey" series, respectively, with most of the actual development done at Spike Chunsoft, while Atlus acted as supervisors. The game was directed by Yukari Yokoro and Seiichiro Nagahata, and produced by Shigeo Komori. Background designs were handled by Nizo Yamamoto, while character design was split between Kaoru Hasegawa who designed the character classes, and Shin Nagasawa who designed the enemies; additionally, some character designs from previous "Etrian Odyssey" games, done by Yuji Himukai, were brought back for "Etrian Mystery Dungeon".