Tate Yuusha is not your average hero story, that's what I want to emphasize from the start. If you expect things started great/awesome from the beginning, and can't tolerate a little bit drama, I suggest you to look away, as you'll be disappointed anyway. I think it's clear from the synopsis too.

Okay lets move to the actual review, I think this could be one of the best isekai(another world) stories I've read or watch until now. If you have a lot of experience in isekai anime/manga, you'll find this to be unique. This might remind you a lot to real life, where tyrant and corrupt scum sometimes become ruler in our world. our MC won't experience glory or rosy life in the world he's summoned into. He will face humiliation because of the scum I've mention before. But I assure you that's only in the beginning. If you think your heart can take it and don't have problem with a little bit revenge story, you should read this. Because even though the main course is about revenge, I find a lot more sweet and glorious deeds on hero of the shield journey.

That's a little bit more about the story, another strong point of this manga will be the characters. There are huge developments here, even though on few characters only. What we can see from Naofumi, Raphtalia, and some characters when they're first introduced will change greatly as the story progressing. Most of them will experience hardship, and they won't just play around with super OP ability like some other protagonist.

Finally, I will recommend this as either fantasy or drama isekai manga. I find some news that there will be anime of this, and I can't wait too see it.