On Oogami Island, the Unknown Level 4 contagion has engulfed the once peaceful shores in turmoil. Trapped inside a sports facility, Hyuuga Natsu, Ochi Akari, and Hanazawa Airi work to secure their surroundings while the infected press closer. In this episode, their search for an exit grows urgent as they share limited resources and piece together the outbreak's rapid spread. The girls' resolve is pushed to its limits amid the encroaching threat.