"In the Heart of Kunoichi Tsubaki" is a manga series set in a secluded village inhabited exclusively by kunoichi, or female ninjas, who are trained in the arts of stealth, combat, and espionage. The story centers on Tsubaki, a skilled and dedicated young kunoichi who is part of the Dog Squad, one of several teams within the village. The village operates under strict rules, one of which prohibits any interaction with men, as it is believed that such contact would weaken their abilities and disrupt their training.

Tsubaki, despite her prowess and dedication, harbors a deep curiosity about men, a topic that is strictly taboo in her community. This curiosity often leads her into humorous and awkward situations, as she tries to reconcile her duties as a kunoichi with her growing fascination. Her teammates, each with distinct personalities and skills, frequently find themselves drawn into her misadventures, adding layers of camaraderie and lighthearted conflict to the narrative.

The series explores the daily lives of the kunoichi as they train, compete, and navigate the challenges of their isolated existence. Each chapter often presents self-contained stories that highlight the quirks and dynamics of the characters, while gradually revealing more about the village's traditions and the reasons behind its strict rules. Tsubaki's journey is marked by her attempts to understand the world beyond the village, even as she remains committed to her role as a kunoichi.

Key characters include Tsubaki's fellow Dog Squad members, such as the serious and disciplined Asuka, the mischievous and playful Sazanka, and the quiet but observant Benisumomo. Other squads, like the Cat Squad and the Monkey Squad, also play significant roles, contributing to the village's vibrant and competitive atmosphere. The interactions between these characters provide both comedic moments and insights into their individual struggles and aspirations.

The narrative balances humor with occasional moments of introspection, as Tsubaki and her peers grapple with their identities and the expectations placed upon them. While the series maintains a lighthearted tone, it occasionally touches on themes of independence, curiosity, and the tension between tradition and personal growth. Through its episodic structure and focus on character dynamics, "In the Heart of Kunoichi Tsubaki" offers a unique blend of comedy, action, and slice-of-life storytelling within the framework of a ninja-themed setting.