"TenPuru" centers on Akemitsu, a young man who, after the death of his parents, is left in the care of his older sister, a devout Buddhist nun. Raised in a temple environment, Akemitsu grows up with a strong sense of discipline and moral grounding. However, his life takes an unexpected turn when his sister decides to leave the temple to pursue her own path, leaving Akemitsu to fend for himself. Struggling with loneliness and the pressures of his new reality, Akemitsu resolves to find a way to reconnect with his sister and understand her decision.

The narrative explores Akemitsu's journey as he navigates the complexities of adolescence, spirituality, and familial bonds. Along the way, he encounters a diverse cast of characters, each with their own struggles and perspectives on life. These interactions challenge Akemitsu's worldview and force him to confront his own insecurities and desires. The story delves into themes of self-discovery, the search for meaning, and the tension between tradition and personal freedom.

Akemitsu's sister, though absent for much of the series, remains a central figure, her influence shaping his actions and decisions. Her departure serves as the catalyst for Akemitsu's growth, pushing him to question the values he has been taught and to forge his own path. The series balances moments of introspection with lighthearted humor, creating a narrative that is both thought-provoking and engaging. Through its exploration of relationships and personal development, "TenPuru" offers a nuanced portrayal of the challenges and triumphs of growing up.