Etrian Odyssey III: The Deep Sea War Princess

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]