"Wakattenai no wa Watashi dake" centers on the life of a high school girl named Haru, who struggles with feelings of invisibility and insignificance in her social environment. Despite her efforts to connect with others, she often feels overlooked and misunderstood. Her life takes a turn when she encounters a mysterious boy named Kakeru, who seems to notice her in ways no one else does. Kakeru, however, harbors his own secrets, including the fact that he can see ghosts and communicate with them. This ability isolates him from his peers, creating a parallel between his loneliness and Haru’s sense of being unseen.

As the story progresses, Haru and Kakeru form a bond rooted in their shared feelings of alienation. Their relationship deepens as they navigate the challenges of their unique circumstances, including Kakeru’s interactions with the supernatural and Haru’s growing awareness of her own self-worth. The narrative explores themes of identity, connection, and the struggle to be seen and understood in a world that often overlooks individuality. Supporting characters, such as Haru’s classmates and Kakeru’s ghostly companions, add layers to the story, highlighting the complexities of human relationships and the impact of past traumas on present lives.

The manga balances moments of introspection with lighthearted interactions, creating a nuanced portrayal of adolescence. Haru’s journey toward self-acceptance and Kakeru’s attempts to reconcile his supernatural abilities with his desire for normalcy drive the emotional core of the series. The interplay between the mundane and the supernatural serves as a backdrop for exploring the characters’ inner worlds, making "Wakattenai no wa Watashi dake" a poignant exploration of loneliness, empathy, and the search for belonging.