The ending of 'Kuro no Senki' wraps up on a note of somber triumph, I think. After the final brutal clash at the capital, Kuro and his surviving followers manage to dismantle the corrupt aristocratic system, but the cost is horrifying. His closest friend, Rein, dies holding a bridge so the others can retreat—that scene wrecked me for days.
Kuro himself doesn't take the throne. He hands power over to the more politically savvy princess, Alizia, and basically exiles himself. The last chapter is just him walking alone down a forest road, his sword over his shoulder. It's ambiguous whether he's looking for a new purpose or just fading away. The revolution succeeded, but the personal toll makes it feel less like a victory parade and more like surviving a storm.
Some fans were mad he didn't get a clear happy ending, but I thought it fit his character. He was always more of a blunt instrument for change than a ruler. The series never promised a clean resolution.