Surviving in post-apocalyptic world with sliced bread!

The world has come to an end, but luckily(?) Ikaru and Atori, sisters, remain. They have their reasons for not returning to Sogoshie Village, where they used to live. With their retreat cut off, they turn to a life of survival, but to live is to eat. No food means no future. That's when they stumble across a large stockpile of sliced bread. Their joy is short-lived, as sliced bread is something unknown to them. The two sisters, who don't even know how to eat sliced bread, begin a journey of coming to grips with sliced bread!

(Source: Kodansha, translated)