Following the sudden earthquakes in Kumamoto Prefecture, Natsuna Keyaki loses contact with her closest online friend, Itsuki. Armed only with a hand-drawn picture of the landscape, Natsuna sets out on a journey from Tokyo to Kumamoto to find her. When Natsuna becomes lost in a rural part of the disaster-stricken prefecture, she meets a policeman and an energetic middle school girl named Izumi Chiba. Izumi, together with her hospitable family, provides Natsuna with shelter and information to help with her search. With these kind locals assisting her at every step, Natsuna gets closer to discovering what happened to Itsuki.