In the life of Issei Hyoudou, an unremarkable high school student with a penchant for the perverse, an unexpected twist of fate shatters his mundane existence. A beautiful girl's invitation to a date seems like a dream come true for the hapless Issei, but the dream quickly morphs into a nightmare when his would-be girlfriend reveals herself as a fallen angel and brutally ends his life. However, death is not the end for Issei, as he finds himself resurrected by the alluring Rias Gremory, a high-ranking devil who inducts him into the school's mysterious Occult Research Club as her loyal servant. As Issei grapples with his new reality as a devil, he must learn to navigate the treacherous world of supernatural beings, where angels and devils clash in an eternal struggle for dominance. With each passing day, he finds himself drawn deeper into the intricate web of his new life, facing both the hilarious and risqué situations that arise from his interactions with his fellow club members. All the while, Issei must maintain the façade of a normal high school student, keeping his devilish secret hidden from the prying eyes of his friends and family. In this battle between heaven and hell, the fate of Issei's once-ordinary life hangs in the balance, and the question remains: who will emerge victorious in this epic struggle between the forces of light and darkness?