Devils cannot manifest without a living vessel, yet a person with enough resolve can subdue the demon and absorb its strength, becoming a Devilman.
Akira Fudou is meek and plain, yet he carries a tender heart. When his childhood companion Ryou Asuka requests aid in hunting devils, Akira agrees immediately. To his astonishment, the location they investigate is Sabbath—a raucous gathering of excess and vice. Amid bloodshed and fatalities, demons seize the revelers, reshaping their bodies into monstrous forms that unleash chaos. In a desperate bid to rescue his best friend, Akira inadvertently bonds with the demon Amon and transforms into a Devilman, acquiring the might to vanquish the remaining fiends.
This newfound alliance bestows immense power but also awakens a fierce, primal side within Akira. Possessing a demonic body yet retaining his fragile spirit, he teams with Ryou to eliminate those who threaten humanity and his dear ones. They vow to protect all innocent souls from the darkness that looms beyond, forever together for ever.