Fukushuu o Koinegau Saikyou Yuusha wa, Yami no Chikara de Senmetsu Musou suru is a dark fantasy series centered on a hero's brutal revenge after his betrayal by humanity. Chapter 6 showcases the protagonist's, Raul Evans, return to the Imperial Capital to begin his retribution against those who once celebrated his downfall.
You can read the series and check for updates on MangaDex or explore chapter discussions on Reddit. Fukushuu o Koinegau Saikyou Yuusha wa, Yami no