Incredibly original, and without the standard isekai/tensei cliche.
The story is unique, and even the fillers are fun.
And the best! No harem with empty characters with no personality.
In a sea of generic isekai we have this wonder
As you read you feel that you are having some evolution both in the story and in the characters
and the vast majority of secondary characters have original personalities
and also the author follows his own rules and doesn't invent a random power out of nothing to make the story work
what I liked the most is that the characters are not invincible, they know they can die if they make mistakes and their decisions have consequences