"O-bake no... Holly" is a supernatural comedy anime that revolves around the misadventures of Holly, a young girl who discovers she is a ghost after a tragic accident. The series begins with Holly waking up in a strange, unfamiliar world, only to realize she has died and become a spirit. Despite her new ghostly form, Holly retains her cheerful and mischievous personality, often using her newfound abilities to interact with the living world in humorous and unpredictable ways.

The narrative primarily focuses on Holly’s attempts to adjust to her afterlife while maintaining a connection to the human world. She frequently visits her former home, where her family continues to live, unaware of her presence. Holly’s interactions with her family and friends are tinged with both comedy and poignancy, as she struggles to communicate with them and come to terms with her own death. Her ghostly antics often lead to chaotic situations, blending slapstick humor with moments of heartfelt emotion.

Key characters include Holly’s younger brother, who begins to suspect her presence, and her best friend, who becomes an unwitting participant in her supernatural escapades. The series also introduces other spirits and supernatural beings, each with their own quirks and personalities, who interact with Holly and contribute to the comedic and fantastical tone of the story.

The plot is episodic, with each episode presenting a new scenario or challenge for Holly to navigate. These range from her attempts to help her family in subtle ways to her encounters with other ghosts and supernatural entities. The series balances lighthearted humor with occasional moments of introspection, exploring themes of loss, acceptance, and the enduring bonds of family and friendship.

Overall, "O-bake no... Holly" offers a blend of supernatural comedy and emotional storytelling, centered around a lively protagonist whose ghostly existence brings both chaos and warmth to the lives of those around her.