Like most fantasy/harem anime this anime plot is easy to read through , you can clearly see what's coming next but it have really good points in his plot. Passing directly to the anime : Story : The start of this anime don't have a true meaning, its like being pushed right in . We start without information about the MC ,his circumstance at start ,his personality ; Some might say plot like this are overused but in this anime , the monster ( called dragon ) have a certain "mission" a true goal before destruction unlike others anime where they just cometo destroy the world.
The true minus is about the mob girl ( "same" being as MC in term of plot ) being "incoherent" with the plot ( Some monster , each monster try to find a precise girl , mob character might be one of those the monster chase but they is too many mob girl in school compared to number of monster ) and all the Main girl ( chased one ) are in the same classes since the start , like saying all the girl out here are just really there for showing the "school-life" even though making a near-0 apparence

Art :
How you see art depend on the people so what i say might don't be true for some and wrong for other.
To me , the art in this are very good , the color aren't too flashy or dark making it easy to watch ( Not have to force yourself when it's too dark or have to decrease the luminosity ).

Sound :
I'm not really good at differentiating sound in anime so for me it's a basic rate

Character :
I loved the MC personality , unlike others harem MC who are really dense , he know what he is doing and why he do it , the girl main character ( all his classes to me ) have different who make them unique.

Enjoyment :
I always liked watching anime with much personalities , a defined plot and the way MC fight so for u people it might be untrue too.

Overall :
The rating i did might not rejoin my word because its really hard to find word without spoiling a inch , i tried to make it so you can enjoy without knowing it all already.