Kansen 5: The Daybreak is set on Oogami Island, a once-peaceful place now overrun by a devastating contagion known as Unknown – Level 4. As the epidemic spreads, three girls—Hyuuga Natsu, Ochi Akari, and Hanazawa Airi—become trapped in a sports facility, struggling to survive as they are relentlessly pursued and assaulted by the infected. This dark and intense hentai series explores themes of horror and desperation in a world consumed by chaos and lust.