I Played the Role of a Hated Hero, but for Some Reason I’m Loved by the Last Boss and Living with Her!

Together with his companions, the hero Ares was facing the final battle with the demon Demiurge. However, due to his habitual misbehavior, he becomes alienated from his three companions just before the battle, leaving him to challenge the final boss fight alone. Against Demiurge's powerful barrier, which repels all attacks, Ares takes a final step in exchange for his life, but... Love will save the world! What shocking vision of the future awaits the hero Ares?