Hakai Keiji is a third-year student at Kuoh Academy and the main protagonist of the story Heir of Destruction. He is a demigod, the son of Shiva, the Hindu God of Destruction, and the human woman Naomi Keiji, a famous retired exorcist. He is also the older half-brother of Megumi Ambrosius Keiji, a descendant of Merlin Ambrosius from her father's side. He is also a descendant of the Virigin Mary, also known as the Woman of the Apocalypse mentioned in the Apocalypse and thus holds the soul of Trihexa, making him the primary target of the Dark Harbingers. Hakai is also the leader of the group Forza Esterna and after defeating Fenrir by himself, is ranked among the "Top 10 Strongest Beings in the World".