In the small village of Yamakoshi, a dog named Mari gives birth to three puppies, much to the joy of young owners Ryota (Hiroto Ryohei) and Aya (Sasaki Mao). Soon after on October 23, 2004, a major earthquake hits the area, and entire sections of Yamakoshi are reduced to rubble. Away from home, Ryota and father Yuichi (Funakoshi Eichiro) escape the worst of it, but Aya and Grandfather Yuzo (Utsui Ken) are trapped in their collapsed house. A rescue team arrives in time to save them, but there is no room for Mari and her newborn pups on the helicopter. With the entire village evacuated and blocked off, Mari and her puppies are left to their own means in the desolate village.