"Shin Jungle no Ouja Tāchan" is a manga series that centers on the adventures of Tāchan, a young boy who becomes the king of the jungle after being raised by animals. The story begins with Tāchan being abandoned in the jungle as a baby, where he is discovered and nurtured by a gorilla named Gorilla. Under Gorilla's care, Tāchan learns to survive in the wild, developing extraordinary strength, agility, and a deep connection with the animals of the jungle.

As Tāchan grows, he encounters various challenges and adversaries, both human and animal. His unique upbringing grants him the ability to communicate with animals, and he often uses this skill to resolve conflicts and protect the jungle from threats. The narrative explores themes of coexistence between humans and nature, as Tāchan frequently finds himself mediating between the two worlds. His interactions with humans often highlight the destructive tendencies of civilization, contrasting sharply with the harmony he experiences in the jungle.

The plot is episodic, with each chapter presenting a new challenge or adventure. Tāchan faces poachers, rival animals, and even supernatural entities, all while striving to maintain balance in the jungle. His companions, including a loyal elephant named Booby and a mischievous monkey named Chibi, play significant roles in his journey, providing both comic relief and crucial support during critical moments.

Throughout the series, Tāchan's character evolves as he grapples with his dual identity—part human, part jungle king. His encounters with humans, particularly a young girl named Mii, introduce him to aspects of human society, such as friendship, love, and loss. These experiences deepen his understanding of the world beyond the jungle, adding layers to his character and the narrative.

The manga blends action, humor, and emotional moments, creating a dynamic and engaging story. Tāchan's unwavering commitment to protecting the jungle and its inhabitants serves as the central driving force of the series, making it a compelling tale of adventure and resilience. The episodic structure allows for a variety of settings and conflicts, ensuring that the story remains fresh and unpredictable.