Shoujo Shikkaku

A new student joins the third-year class C at Hanazono Girl's Middle School. Akane, a quiet girl who has grown weary of her overbearing friends, holds a passive view toward the world's potential destruction. One day, the entire class awakens in a ruined school setting with countdown timers. Each girl is paired with another, and the pairs must endure a seven-day survival challenge. Akane is paired with the enigmatic transfer student. As the competition begins, relationships break down, hope diminishes, and mental resilience is tested.