"Kentoshi" is an anime series set in a world where humanity faces extinction due to a mysterious phenomenon known as the "Collapse," which causes people to transform into monstrous entities called "Hollows." The story centers on Kento, a young man who survives the initial wave of destruction and discovers he possesses a unique ability to resist the Collapse. This ability draws the attention of a secretive organization known as the "Guardians," who recruit Kento to combat the Hollows and uncover the truth behind the Collapse.

The narrative unfolds as Kento joins a team of similarly gifted individuals, each with their own tragic pasts and motivations. Together, they embark on missions to protect surviving human settlements and investigate the origins of the Hollows. As the series progresses, it becomes clear that the Collapse is not a random event but the result of a larger, more sinister conspiracy involving powerful factions vying for control over the remnants of humanity.

Key characters include Aya, a skilled fighter with a mysterious connection to the Collapse; Ryo, a former scientist who seeks redemption for his role in the disaster; and Sora, a young girl whose innocence hides a dangerous secret. The dynamics between these characters drive much of the emotional tension, as they grapple with loss, betrayal, and the moral complexities of their mission.

The plot is structured around a series of escalating conflicts, both external and internal. The team faces increasingly powerful Hollows, each representing a deeper layer of the Collapse's mystery. Simultaneously, internal strife arises as secrets are revealed, testing the group's unity. The series balances action-packed sequences with moments of introspection, exploring themes of survival, identity, and the cost of power.

By the end of the series, the true nature of the Collapse is unveiled, tying together the fates of the characters and the world they inhabit. The resolution leaves room for interpretation, with lingering questions about the future of humanity and the possibility of redemption in a fractured world.