"Alice in the Country of Hearts: Wonderful Wonder World" is an anime adaptation of the visual novel and manga series, reimagining Lewis Carroll's "Alice's Adventures in Wonderland" with a darker, romantic twist. The protagonist, Alice Liddell, is forcibly transported to a surreal world known as the Country of Hearts after being kidnapped by a mysterious man named Peter White. This world is populated by anthropomorphic characters, each representing a card suit or a role from the original story, but with altered personalities and relationships.

Upon arrival, Alice discovers that the inhabitants of the Country of Hearts are bound by a system of "role enforcement," where they must adhere to specific behaviors and duties dictated by their roles. The world is divided into territories, each ruled by a "Role Holder" who wields significant influence. These territories include the Heart Castle, ruled by the tyrannical Queen of Hearts; the Hatter Mansion, controlled by the mafia-like Blood Dupre; and the Amusement Park, overseen by the enigmatic Nightmare Gottschalk. Each Role Holder has a unique connection to Alice, often involving romantic or antagonistic undertones.

Alice's presence disrupts the balance of the Country of Hearts, as she is an outsider unbound by the rules of role enforcement. Her interactions with the characters reveal their struggles with identity, freedom, and the constraints of their roles. Blood Dupre, the Hatter, is a charismatic but dangerous figure who leads a gang and harbors feelings for Alice. Julius Monrey, the Clockmaker, is a reclusive and pragmatic individual who repairs the clocks that symbolize the passage of time in this world. Nightmare Gottschalk, the Dream Demon, serves as a guide of sorts but is often cryptic and manipulative. Peter White, Alice's kidnapper, is obsessed with her and frequently interferes in her journey.

The narrative explores themes of love, loyalty, and self-discovery as Alice navigates the complexities of the Country of Hearts. Her relationships with the male characters often blur the lines between affection and manipulation, reflecting the chaotic and unpredictable nature of the world. The Queen of Hearts, a central antagonist, enforces her rule through fear and violence, creating tension and conflict within the territories. Alice's refusal to conform to the expectations of the inhabitants challenges the status quo, leading to moments of rebellion and introspection among the characters.

The story unfolds through a series of episodic encounters, with Alice gradually uncovering the mysteries of the Country of Hearts and her own role within it. The anime adaptation condenses the intricate plotlines of the source material, focusing on key relationships and events while maintaining the surreal and dreamlike atmosphere of the original work. The interplay between Alice and the Role Holders drives the narrative, culminating in a climactic confrontation that forces Alice to confront her feelings and the consequences of her presence in this strange world.