Etrian Odyssey Untold: The Millennium Girl

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.

An original story adaptation based on the third installment in the Etrian Odyssey franchise. Former Princess Celia Zoe Granvania and her Ninja retainer Fuuka hitch a ride on a merchant ship sailing to the magnificent Sea City of Armoroad, where an enormous World Tree of Yggdrasil looms over. Wanting to explore the vast labyrinth that it houses underneath, Celia hopes to uncover the reason why everything she once held dear is gone... [Source: MangaDex]