u/Professional-Map-668

So, what i remember. I was 13 or 14 years old, this anime was on TV at Animax channel, and there was a guy, middle aged, (i dont remember his look) fighting on a rooftop of a building in a city, he transformed to a knight with an armor (a little futuristic, but not a mecha) a sword appeared in his hand, i think it was some kind of blue electrical sword, i remember a dobule-edged sword with a blue lining on it. He was fighting an enemy, i think a mosnter, and when he killed it, the sword consumed the enemy, and the hero was standing and looking at the moon with his armor still on. Idk if i remember well, but i cannot find what i saw. This was 15 years ago. If you remember similar to this, please help me. Thanks!