"The Invisible Man and His Soon-to-Be Wife" centers on Saitou, a man who has lived his entire life invisible due to a rare condition. His invisibility isolates him from society, making it difficult to form connections or lead a normal life. Despite this, he maintains a kind and gentle demeanor, yearning for companionship. His life takes a turn when he encounters Machi, a cheerful and empathetic woman who can see him despite his condition. Intrigued by his situation, Machi decides to help Saitou navigate the challenges of his invisibility, and their relationship gradually deepens.

The narrative explores their evolving bond as they face societal prejudices and personal insecurities. Saitou struggles with feelings of inadequacy and fear of rejection, while Machi grapples with her own vulnerabilities and the complexities of loving someone who is fundamentally different. Their journey is marked by moments of humor, tenderness, and introspection, as they learn to trust and support each other. The series also delves into the broader implications of Saitou’s invisibility, touching on themes of identity, acceptance, and the human need for connection.

Supporting characters, such as Saitou’s childhood friend and Machi’s family, add depth to the story, providing contrasting perspectives on Saitou’s condition and the couple’s relationship. The series balances its emotional core with lighthearted moments, creating a narrative that is both heartfelt and engaging. Through its exploration of love and visibility, "The Invisible Man and His Soon-to-Be Wife" offers a thoughtful portrayal of how two individuals navigate the challenges of being seen—both literally and metaphorically—in a world that often overlooks the unseen.