Since ancient times, the tree Yggdrasil has towered over the country. There a great labyrinth with monsters is the target of many adventurers: some to win glory, some looking for valuables only found in the labyrinth, and still other to uncover the mysteries seated there. At the foot of Yggdrasil the liveliness town called Hi Lagaard, an adventurers town. And the gunner little girl Manarii is back...

This manga is based on the second Etrian Odyssey game and chronicles the exploits of a young gunner and the group of adventurers she joins up with.