Japan has become a wasteland devastated by the Rusty Wind which causes all things to rust away. A suspicious looking priest visits a checkpoint all alone, yet on his back rests a bow priests wouldn't use.
Meanwhile, Milo, a doctor running a clinic in the town of Imihama, is researching new medicines in secret in order to save his older sister, Pawoo, who's being corroded by the Rust. But that day a stranger appears before him...
So remember, never take 
Mushroom Keepers as clients.
تذكّرن، لا تقبلن رعاة الفطور كزبائن
Hergehört, ihr dürft keinen Pilzhüter
als Kunden annehmen, klar?
No acepten como cliente
a ningún Protector de Hongos.
No aceptéis como cliente
a ningún Protector de Hongos.
Quoi qu’il arrive, ne prenez jamais
de gardien de champignon en clients.
Quindi mi raccomando, non accettate mai
 i Custodi di Funghi come clienti.
Lembrem-se de não aceitar um 
Guarda do Cogumelo como cliente.
Запомните, вы тоже
никогда не ведите дел с грибными стражами!