Set in the year 20XX, "ALL YOU NEED IS KILL" tells the story of Rita, a resourceful but lonely young woman who volunteers to help rebuild Japan after the mysterious appearance of a massive alien flower known as "Darol." When Darol unexpectedly erupts, triggering a deadly event and unleashing monstrous creatures that decimate the population, Rita is drawn into the destruction—and perishes. But then she awakens again. And again. Trapped in an endless time loop, Rita must grapple with trauma and repeated death until she finally meets Keiji, a shy young man trapped in the same cycle. Together, they struggle to break free and find meaning in the chaos around them.