Maoyuu Maou Yuusha episode 6 is about how Hero takes back Gate City from the humans and how the humans take back their island. Hero uses trickery by getting the help of fairies and the nightmare thrush to scare the humans. The humans use superior forces to take down the demons after they came up with the plan of making a land bridge, so that they did not have to cross the water by boat.
Maoyuu Maou Yuusha came up with an interesting way around the boat problem. If they could not make it there by sea then make a land bridge from the ice. The execution does not make a lot of sense though. If they were unable to make it across the water then how were they able to make it across the water to get onto the ice? They had to be on boats for that. Also how did the demons not notice the land bridge until it was complete? If they did notice it then how did they not manage to report it until the thing was complete? While the idea is cool and would get rid of the problem of fighting on the water it should not have worked. There should have been demons keeping an eye on the waters all the time looking for humans coming after them that would have stopped them.
For the first time in Maoyuu Maou Yuusha, the Demon King has done something that would directly hurt her people. The Demon King was just trying to get the war to end due to the people keeping it going deciding it was no longer worth it. They do this because the Winter King told her that acquiring the island would help them no longer need the support of the central nations. Therefore she gave them support to win. She had Hero bring in back up for the humans which she somehow thought would still let the demons get away. That was just her keeping her head in the sand though because the humans would not let the demons get away no matter what. The Demon King does not even seem really broken up about it which is disturbing since they are her people. She has spent all this time helping the humans, but what about the demons who are supposed to be her first priority? In the end having the war over will help them, but is she going to keep a blind eye to the atrocities happening to them until the war is over? The hero seems more concerned about the demons than she does when he helps them get better conditions in Gate City. Demon King seems to be taking her Crimson Scholar act too much to heart and has mostly forgotten about the people she came from, but hopefully later on there will be times where she does things for the demons as well.
Obviously Knight wanted him to check out her chest.
Because after that she wore this dress later.