Board Thread:Game Updates/@comment-25730832-20190204140521/@comment-26082284-20190208202425

5-1 require clearing 3-4, 5-2 require 4-4, 5-3 and 5-4 are straightforward - accesible after clearing preceding maps.

Lv 30 is very weak for World 5, but Hiei has to be flagship for the quest anyway, so with that extra protection I'd say it's possible as long as other girls in the fleet are up for the challenge.