Yuusha to Maou no Konpaku Rekitei (Extasis) is a Manga/Manhwa/Manhua in (English/Raw) language, Adventure series, english chapters have been translated and you can read them here.
A blessed Hero. A vicious Demon Lord. A common objective. An epic battle between good and evil whose outcome will shape the new era the world will enter has reached its endgame… However, things aren’t what they appear to be and plans take an unexpected turn.