Does anyone know the name of this anime anime?

Does anyone know an anime where its about guys who in a group of around 4 or 3 girls. He finds a relic that looks like a sword but when he uses it. An armour engulfs him, he is pretty strong. there is only one season i blelive, it came out a while ago like 7+ years ago. He has like a harem around him.

View Reddit by MegaMunch24View Source