Everything for Demon King Evelogia

An aimless young man named Toshiaki Gozu is killed on page 3, and resurrected as a background character in a game world he has been playing. Gozu encounters the Demon King Evelogia, the game's last boss whom Gozu has adored since he was little. Gozu begins to woo Evelogia by admitting, "I fell in love with you." Together, they aim to conquer the world.