Yuusha

勇者

The main male protagonist and the greatest warrior of the Human realm abandons his mission to slay the Demon Queen after being convinced to join her efforts to secure a truly peaceful resolution to the war between Humans and Demons. This involves first addressing the issues within both societies that could lead to greater turmoil once the conflict ends. He is an unmatched swordsman capable of standing against the strongest Human or Demon, and he possesses powerful magic ranging from healing to creating familiar spirits, as well as the ability to instantly teleport to any location he has previously visited. He eventually develops feelings for the Demon Queen, which are reciprocated.
As part of the Demon Queen's plan, he conceals his true identity and adopts the name White Swordsman (Shiro no Kenshi?). While traveling through the Demon Realm as a peacekeeper, he wears imposing black armor belonging to a former Demon Lord, referring to himself as a servant of the Demon Queen called the Black Knight (Kuro Kishi?). The Hero previously fought alongside three companions: a Female Knight, an Archer, and a Wizard, who went their separate ways after the Hero left the party to confront the Demon Queen alone.