Western Fantasy: I Picked Up a Little Sister, but the Demon King Is a Siscon

It should be considered fast-paced? The Demon King has it, but it seems that he only stayed with the protagonist for a few chapters, and then was forced to go offline due to things such as the reform of the Demon King's city (taught by the protagonist), leaving two guards. There was a top fighter who (should) be a teacher in the background, although the relationship was temporarily severed after a few chapters. The protagonist is talented and loves to pick up people, likes to wander around (should be), is good at wind magic and overwhelming people with force (the teacher saved me and my teacher is xxx🐶)

It feels ok, author, cheers

Generally speaking, it looks like a fog.