"Mama Akuma" centers around a demon named Sebastian, who is summoned by a young girl named Sakura. Instead of demanding a grand wish or seeking to cause chaos, Sakura asks Sebastian to become her mother. Confused but intrigued, Sebastian agrees, leading to a series of comedic and heartwarming events as the demon adjusts to human life and the responsibilities of parenthood. The narrative explores the dynamics of their unconventional family, blending supernatural elements with slice-of-life humor.

Sebastian, a powerful and prideful demon, initially struggles with mundane tasks like cooking, cleaning, and attending school events. Over time, however, Sebastian grows attached to Sakura and begins to take the role of a mother seriously, often going to great lengths to protect and care for her. Sakura, on the other hand, is a cheerful and determined child who sees the good in Sebastian despite their demonic nature. Their relationship evolves as they navigate everyday challenges, from school festivals to misunderstandings with neighbors.

The supporting cast includes Sakura’s classmates, teachers, and other supernatural beings who occasionally cross paths with the duo. These characters add depth to the story, often creating situations that highlight Sebastian’s growing humanity and Sakura’s unwavering optimism. The series balances humor with moments of genuine emotion, showcasing the bond between a demon and a child in a way that feels both unique and relatable. Themes of family, acceptance, and personal growth are woven throughout the narrative, making "Mama Akuma" a distinctive blend of fantasy and everyday life.