This is going to be a spoiler free and a short review.

Story:
The story is in my view is unique and interesting. The pacing is without issues in my view and flows really well.

Art:
The art is fine; it is detailed when it needs to be, it is not when it's to make something comedic or to draw attention to. It is endearing and is definitely pleasant to look at.

Character:
This is perhaps my favourite part of Mairimashita! Iruma-kun. I can't seem to help but love every character. When a character is first introduced I didn't tend to like them but that is quickly swept away when they mesh so well with the rest of the cast.

Enjoyment:
I binged this all in one night. >.<

Overall:
I love this Manga so much.