"Neoteny" is a manga series that explores themes of identity, memory, and the passage of time through a blend of science fiction and psychological drama. The narrative centers on a young man named Akira, who awakens in a futuristic city with no recollection of his past. He discovers that he is part of a mysterious experiment conducted by an organization known as the Chronos Institute, which specializes in manipulating human development and aging. The institute's goal is to unlock the potential of "neoteny," a biological phenomenon where individuals retain juvenile traits into adulthood, believed to hold the key to extending human life and enhancing cognitive abilities.

As Akira navigates this unfamiliar world, he encounters other subjects of the experiment, each with their own fragmented memories and unique abilities. Among them is Yumi, a girl who exhibits extraordinary resilience and adaptability, and Ryo, a brooding figure with a deep mistrust of the institute. Together, they uncover fragments of their past lives and begin to piece together the truth behind the experiment. The institute's motives are gradually revealed to be more sinister than initially apparent, with ethical boundaries blurred in the pursuit of scientific advancement.

The plot unfolds through a series of interconnected flashbacks and present-day events, creating a layered narrative that explores the psychological toll of memory manipulation and the ethical implications of tampering with human biology. Akira's journey is marked by internal conflict as he grapples with questions of self-identity and the morality of the institute's actions. The series delves into the tension between scientific progress and human dignity, raising questions about the cost of immortality and the nature of individuality.

Supporting characters, such as Dr. Saito, a conflicted scientist within the institute, and Kaori, a former subject who escaped the experiment, add depth to the story by providing contrasting perspectives on the institute's work. The manga's pacing balances moments of introspection with action-driven sequences, particularly as Akira and his allies confront the institute's enforcers and uncover hidden truths about their existence.

"Neoteny" combines a thought-provoking premise with a character-driven narrative, weaving together themes of science, ethics, and personal discovery. The story's exploration of memory and identity is central to its appeal, offering a compelling examination of what it means to be human in a world where the boundaries of life and self are constantly redefined.