Omamori Shimasu Seijo-sama

Overview

On his 17th birthday, Aoi gets the surprise of his life when he's told he's the "Divine Saint" by Joichiro, a self-proclaimed "Knight." According to Joichiro, the divine saint brings good fortune to whoever ends up with her, and gives off intoxicating pheromones that lure those with greed in their hearts. Joichiro insists that Aoi is in grave danger, but is shooed off after Aoi refuses to believe him. However, on his way home from the store, Aoi is attacked from behind by a schoolmate, only to be saved by Joichiro in the nick of time. Aoi soon finds himself falling for Joichiro, who believes him no matter what and always comes to his rescue. (Source: Renta!) Note: Includes one extra chapter.

Source: AniList