"Calling You" is a manga series that explores themes of loneliness, connection, and the power of imagination through its intertwined narratives. The story is divided into three distinct yet thematically connected parts, each focusing on different characters and their struggles with isolation and communication.

The first part, titled "Calling You," centers on a high school girl named Kotonami, who feels disconnected from those around her. She copes with her loneliness by imagining a cell phone in her mind, which she uses to communicate with an imaginary friend named Yuri. One day, Kotonami receives a call from a real person, a boy named Shinya, who claims to have reached her through his own imaginary phone. As their conversations deepen, Kotonami and Shinya form a bond, but their connection is complicated by the fact that they exist in different realities—Shinya is in a coma, and their communication occurs in a shared mental space. The story explores their emotional journey as they navigate their unique relationship and the boundaries between imagination and reality.

The second part, "Vibrator," shifts focus to a young woman named Rei, who works as a freelance writer. Rei struggles with feelings of emptiness and detachment, often using casual relationships to fill the void. One night, she meets a truck driver named Okabe, and the two form an unexpected connection during a long drive. Their conversations reveal their shared sense of isolation and longing for genuine human connection. The narrative delves into Rei's internal struggles and her gradual realization of the importance of emotional intimacy.

The third part, "Kamisama," follows a high school boy named Takashi, who is haunted by the death of his younger sister, Yuka. Consumed by guilt and grief, Takashi begins to hear Yuka's voice, which guides him through his daily life. As he interacts with her presence, Takashi confronts his unresolved emotions and learns to come to terms with his loss. The story examines themes of grief, memory, and the enduring bonds between siblings.

Each part of "Calling You" is characterized by its introspective tone and focus on the inner lives of its characters. The series uses its supernatural and psychological elements to explore the complexities of human emotions and the ways in which people seek connection in a world that often feels isolating. The narratives are interconnected by their shared emphasis on the power of communication, both real and imagined, to bridge the gaps between individuals.