Busujima wields specialized technology and psychic abilities as a professional psycho diver, entering the subconscious minds of clients trapped by psychological trauma. Renowned as one of the best in this dangerous field, he handles cases deemed too perilous for others.

He maintains a detached, cynical professionalism, reminiscent of noir detectives. Deeming pop star Yuki Kano's case too dangerous, he initially refuses. The talent agency forces his involvement through coercion, culminating in the killing of his dog.

His resilience and skill are severely tested during the mission. An initial psycho dive into Yuki's mind nearly kills him, exposing nightmarish visions and revealing powerful psychokinetic energies tied to a sinister cult. This failure demands better equipment for a second attempt. His investigation expands beyond the psychological, uncovering external threats: cult assassins targeting him and manipulators within Yuki's circle.

Personal stakes develop as he connects with a female talent agent who opposed the coercion and genuinely cared for Yuki. Cult operatives slaughter this agent, intensifying his resolve to resolve the case and confront the cult directly.

His mission culminates in a physical assault on the cult's stronghold alongside an intelligence agent, involving violent clashes with cult members. After this external conflict and revelations of familial betrayal in Yuki's past, he executes a final, deeper psycho dive. Within her subconscious, he confronts manifestations of her guilt and repressed violence, engaging in a physical battle against a dark manifestation of her psyche. Though severely injured, he neutralizes the threat, enabling Yuki's psychological recovery and the return of her singing voice.

The resolution brings professional success but personal loss. He sacrificed his safety and endured the deaths of individuals connected to him during the case. His actions directly free Yuki to move forward; she dedicates her renewed career to him and his fallen associate.