Knify is an anxious schoolboy who, along with his friends Lightbolb, Picture, Charmy, and Yigroish Bottle, is a member of the Sakura Private High School's School Living Club. As Knify seeks out fun school activities every day while living at school, the others work to keep him safe, because, in reality, they are the sole survivors of their school after a dissonance-inducing outbreak overruns the city.