Play as Hayaki, a skilled soldier and member of Reikan, an organization dedicated to investigating and stopping anomalous activities. Recently, a mysterious island has become home to dangerous and unpredictable creatures without any apparent reason, prompting Reikan to investigate the situation. As a member of this elite team, Hayaki is uniquely qualified to navigate the treacherous terrain and uncover the truth behind the island's secrets. But his motivations run deeper than just fulfilling his duty to Reikan. He's searching for his missing brother, another member of the organization who disappeared on the island under mysterious circumstances. Driven by a fierce desire to find his sibling, Hayaki will stop at nothing to unravel the island's secrets and uncover the truth behind his brother's disappearance.