"Oni no Hanayome wa Taberaretai" is a fantasy romance manga that centers on the relationship between a human and an oni (demon) in a world where humans and supernatural beings coexist. The protagonist, a young man named Kaito, finds himself in an unusual predicament when he is chosen as the bride of an oni princess named Kurama. This arrangement stems from an ancient tradition where oni select human brides to sustain themselves by consuming their life force. However, Kurama is unlike other oni—she is kind-hearted and struggles with her role, as she does not wish to harm Kaito despite her inherent nature.

The story explores the growing bond between Kaito and Kurama as they navigate their unconventional relationship. Kaito, initially wary of his fate, begins to understand Kurama’s gentle nature and her internal conflict. Kurama, in turn, develops genuine affection for Kaito, which complicates her duty to consume his life force. Their dynamic is further enriched by the presence of other oni and humans, each with their own perspectives on the tradition and the evolving relationship between the two protagonists.

The narrative delves into themes of coexistence, sacrifice, and the complexities of love across species. It balances lighthearted moments with emotional depth, as Kaito and Kurama confront societal expectations and their own feelings. The manga also introduces various supernatural elements, including other mythical creatures and the cultural practices of the oni, which add layers to the world-building. Through its exploration of trust and mutual understanding, "Oni no Hanayome wa Taberaretai" presents a unique take on the romance genre, blending fantasy and emotional storytelling.