Sum up of the chapter (made by basing myself on the novel):

MC wakes up being a bit... tired. Strange. He also remembers feeling as if he was wrapped with feathers during the night. Might have something to do with the harpies' feathers that he obtained during the previous day? Oh? And the harpies seem to be quite happy and more "touchy touchy" than before while Sylphy looks quite embarrassed. I wonder what happened during the night! ^^ Well, probably nothing lewd as he stayed alsleep / wasn't wake up, right?

Anyway, MC and his group continue to advance. Their current objective hasn't changed: They need to provide some help to Leonard's group and the refugees that they rescued from slavery. As the refugees will need food, rest, supplies in order to continue traveling toward the main base, MC prepares a little fortress. But, considering that the said fortress might get taken by the enemy, he also plants a lot of TNT blocks. After all, it would be a veeeeeeeery bad idea to let them take it: Infinite water, high efficiency farming blocks and an already build fortress that can withstand Gizmas attack and allow them to advance in the wasteland? Yep! Not a good idea to let them take it.

Day after day, MC continues to work on the little fortress, preparing food and other stuffs. And on every mornings, he wakes up being tired... Strange. Sleeping should take care of that. What is happening? Oh. Harpies are still quite happy. Speaking of them, one arrives to give them some informations concerning the situation: The enemy noticed Leonard's group and their light cavalery is harrassing them while waiting for backup. While Leonard is quite strong and can protect the refugees, things will go badly if they're attacked by a large group (100 cavalry, 600 infantry, 200 archers). So in order to save them, harpies are sent to test their new toy! The enemy isn't really expecting "shit birds" to have the firepower of a strong mage. The result? Let's just say that there is a good reason why the chapter is litterally called "Hello, Holy Kingdom Army-san. It's the Harpy Bomber Corps."

Now some spoilers = if you don't want to get spoiled, please, ignore the rest of this message:

First concerning what is "happening during the nights" / why MC is waking up tired: Melty knows that MC is loyal to Sylphy and this is a problem for her as she wants to seduce him as well. So in order to achieve her goal, she decided to "persuade" Sylphy. Sylphy doesn't know what to do. Sure, she would like to keep MC for herself... but she's also afraid that other women might manage to take him away. The same thing can be said about the harpies: Sylphy knows that they'll be a very powerful asset during the upcoming conflict... but what would happen if they decide to go away? In the end, the solution is quite simple: To give them what they want. They want to become MC's wifes? Sure! And with that, more women will be here to protect MC from others. So, in order to solidy her position as MC's first wife, she prepared a "group activity", put MC to sleep by using her magic and showed them how to do it.

And now concerning the fate of the fortress: It'll be used to give some time to the refugees and allow them to travel to the main base safely. Then, as the enemy is coming with an army of 5500 men, MC will proceed to evacuate. When they see the fortress, they're quite surprised but will welcome it as they can use it to conquer the wasteland and maybe even attack the elves in order to capture some women so they'll secure it. Said fortress is too small for the whole army but camping around it is enough. Sadly for them, they don't know about the TNT nor what it is... The harpies that MC sent in order to monitor the situation will see more than 80% of the said army get blown up. For the 20% that are still alive? Well, first: Being alive doesn't mean "being intact". Secondly, the harpies are also planning to bomb the area as well. And once it's over, the gizmas will take care of whatever is left.

So they are officially DEATH BIRDS! Or HARPY BOMBERS! A bit better than "shit-birds" as they used to be called by the enemy.

lmao how didn't he awake?