Shinkaigyo

A scientist named Kyou Rouhan develops K-1, a shark-like aquatic creature designed to combat viruses within the human body. Despite its intended purpose, K-1 exhibits aggressive tendencies, posing a potential threat to humanity. Unexpectedly, K-1 merges with a compassionate boy known for his care toward his younger sister. The story explores this unusual partnership in a marine science fiction setting focused on battling viral threats.