"Hoikumen!" centers on the life of Takuya Andou, a former corporate worker who transitions into the role of a nursery school teacher after a career shift. The narrative explores his journey as he navigates the challenges and rewards of working in childcare, a field traditionally dominated by women. Takuya’s decision to become a "hoikumen" (a male childcare worker) is driven by his desire for a more fulfilling career, but he quickly realizes the societal biases and personal hurdles he must overcome.

The story delves into the daily routines and responsibilities of nursery school teachers, highlighting the emotional and physical demands of the job. Takuya’s interactions with the children, their parents, and his colleagues form the core of the narrative. His dedication to understanding and supporting the children’s growth is contrasted with the skepticism and prejudice he faces as a male in a female-dominated profession. The series also portrays the diverse personalities of the children under his care, each with unique needs and challenges, which Takuya learns to address with patience and creativity.

Supporting characters include Takuya’s fellow teachers, who initially question his suitability for the role but gradually come to respect his commitment. The parents of the children also play a significant role, with some expressing concerns about a man caring for their children, while others appreciate his fresh perspective and dedication. The series balances lighthearted moments of classroom antics with more serious themes, such as societal expectations, gender roles, and the importance of empathy in childcare.

As Takuya grows more confident in his role, he begins to challenge stereotypes and inspire others to reconsider their perceptions of male childcare workers. The narrative emphasizes the impact of his work on the children’s lives, as well as his own personal growth and fulfillment. Through its portrayal of Takuya’s experiences, "Hoikumen!" offers an insightful look into the world of early childhood education and the evolving dynamics of gender in the workplace.