"Haha Dōtei" is a manga series that explores themes of family, identity, and societal expectations through the lens of its protagonist, a young man named Shōta. The narrative begins with Shōta, who has grown up in a single-parent household with his mother, Yūko. Their relationship is close but strained by unspoken tensions and societal judgments. Shōta, now in his late teens, begins to question his own identity and the circumstances of his upbringing, particularly the absence of his father.

As the story progresses, Shōta discovers that his mother has been hiding a significant secret about his parentage. Yūko reveals that Shōta was conceived through artificial insemination, a fact she had kept hidden to protect him from societal stigma and personal confusion. This revelation forces Shōta to grapple with his sense of self and his understanding of family. The narrative delves into his emotional journey as he processes this information, seeking to reconcile his feelings toward his mother and his own identity.

The manga also examines Yūko's perspective, providing insight into her struggles as a single mother in a society that often marginalizes non-traditional family structures. Her decision to use artificial insemination is portrayed as an act of both desperation and empowerment, highlighting the complexities of her choices and the societal pressures she faced. The relationship between Shōta and Yūko evolves as they confront these truths, with moments of conflict, understanding, and eventual reconciliation.

Secondary characters, such as Shōta's friends and Yūko's colleagues, add depth to the story by reflecting broader societal attitudes toward single parenthood and non-traditional family dynamics. These interactions underscore the challenges faced by individuals who deviate from conventional norms, while also emphasizing the resilience and strength required to navigate such circumstances.

The narrative is grounded in realistic portrayals of emotional and psychological struggles, avoiding melodrama in favor of nuanced character development. Themes of acceptance, self-discovery, and the redefinition of family are central to the story, offering a thoughtful exploration of the complexities inherent in human relationships. The manga's pacing allows for a gradual unfolding of the characters' inner lives, creating a compelling and empathetic portrayal of their experiences.