Kono Hi, "Itsuwari no Yuusha" de Aru Ore wa "Shin no Yuusha" de Aru Kare wo Party kara Tsuihou shita is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Foyle, bestowed with the job of the “False Hero,” followed his role and expelled his best friend from the party, who was supposed to be defeated by the awakened “True Hero.” But at death’s door, Foyle is saved by Iris, an elf girl who is the only one that knows his true self, even as a false hero.
Acknowledged by her as “My Hero,” Foyle remembers his aspiration to save people like a hero and begins to desire to do so in the shadows. The “False Hero” who has lost everything becomes the “Hero of Shadows” and decides to embark on a new adventure!