The OP has more animation than the anime itself. It looks like the studio is just making shortcuts with the animation after spending it all up on the OP 😏. This episode introduces the world and the state of its magic technology after 400 years have passed, I find it odd that the MC reincarnated on the same world unlike his first one. As for my impression of the story, it looks like I have read it on a manwha before, iirc it was "Damn Reincarnation" 🤔 so it doesn't give much of a strong impression on me.