The key to fighting the Great Maou.
It is said that only "successors", or in other words, the descendants of the three wise men can properly handle the three powerful magical powers that were once created to oppose the Great Maou.

The explorers found the successor to Melchior, one of the three wise men, and managed to transfer the magic power to her.
In order to find the remaining two successors, they decided to return to meet Chitose again.
Chitose and Marika had discussed what to do if they can't find the successors, as well as some tragedies that had occurred in the previous world.

Why did Als let those tragedies happen when he could have easily prevented them?
The answer to that question will be revealed...!