Yes, I'm a fan of the light novels and it's definitively a slice of life with a isekai coat of paint. The most frustrating thing about it is when people take a quick glance at it and dismiss it as a harem.
Too many girls on cover makes me wonder if it's a crutch because story is bad so I check the plot before I go in.
Don't judge anime solely by the poster!
I love the light novels but it is a slower story so I am not sure if it will have the action to keep viewers. But then again there’s a lot of slice of life series.