Arter a tourist disappears inside a mine in Guanajuato, Mat Medina a young expert in mine engineering is hired to make a security diagnostic in the mines of a big company.

Mina, a young college student, has her life ripped away after her family is killed. When she finds out their murder was part of a botched kidnapping to return her to her real father—a terrorist in the middle east.

In 1945, the second- and third-year students of a Hiroshima girls' school are taken away to work in war factories. The remaining 220 girls of the first year try to make the best of their new-found status as the only teenagers in an almost deserted town, even amid the deprivations of wartime. On the seventh of August, an American bomber changes their lives forever. Broadcast on the 43rd anniversary of Hiroshima in memory of "the girls who lost their lives to the atom bomb." (Source: Anime Encyclopedia)