The world has been destroyed, but sisters Ikaru and Atori have luckily(?) survived. For some reason, they cannot return to "Sogosie Village," where they used to live. With no way out, the two turn to a life of survival, but to live is to eat. Without food, there is no future. At that time, they come across a large stockpile of sliced bread. Their joy is short-lived though, as sliced bread is an unknown entity to the two. The sisters, who don't even know how to eat it, begin their journey of struggling with sliced bread!