"Igor no Shima" is a manga series that blends elements of mystery, psychological drama, and supernatural intrigue. The narrative centers on a remote island where a group of individuals becomes trapped under mysterious circumstances. The island, shrouded in secrecy, is home to a research facility conducting unethical experiments, which gradually come to light as the story progresses. The protagonist, a young man named Igor, arrives on the island under unclear pretenses, only to find himself entangled in a web of deception and danger.

The plot unfolds as Igor and the other stranded characters uncover the island's dark history. The research facility, led by a enigmatic scientist, has been experimenting with human subjects, attempting to unlock hidden potentials within the human mind. These experiments have resulted in bizarre and often horrifying consequences, with some subjects developing supernatural abilities or descending into madness. As Igor delves deeper into the facility's secrets, he encounters other survivors, each with their own motivations and hidden pasts. Tensions rise as trust becomes a scarce commodity, and the group must navigate both external threats and internal conflicts.

Key characters include Igor, whose resilience and determination drive much of the narrative; the scientist, whose morally ambiguous actions and cryptic demeanor add layers of intrigue; and a diverse cast of survivors, each contributing to the unfolding mystery. The island itself serves as a character of sorts, with its eerie atmosphere and hidden dangers amplifying the sense of isolation and dread. Themes of survival, morality, and the consequences of unchecked ambition are explored as the characters confront both the physical and psychological challenges posed by their environment.

The story is marked by a series of twists and revelations, keeping the tension high and the reader engaged. The pacing alternates between moments of intense action and quieter, more introspective scenes, allowing for character development and the gradual unraveling of the island's secrets. The manga's narrative structure effectively builds suspense, culminating in a climactic confrontation that forces the characters to confront the true nature of the experiments and their own roles in the unfolding tragedy.