Grandfather of Modern Isekai. Masterpiece, with reason to be, while storywise it stands out from any other Isekai series by telling the story so smartly in such a way it feels believable. Every main character is complex with it's own motivation and view of the world, so you can't simply judge just from first impressions and need time to learn about them. But the most shocking thing is details and love from creators and artists to everything you see in this new magical world they tell you about.