Jimmy Tong is an expert blackmailer and thief who specialises in white-collar crimes. With his side-kick, Jimmy steals a personal diary belonging to a Yakuza leader Ken Sato intending to use its details as a platform for blackmailing and to extort money. Sato agreed to the uneasy deal and made preparations to pay Jimmy his exorbitant demands only for Sato's girlfriend Jenny to betray him and make off with the money to Okinawa.

The Americans are swiftly closing on Okinawa, an island just south of the Japanese mainland. The Imperial command sends top generals and several army divisions to defend it at all costs. The mission quickly degenerates as vital resources and troops are diverted to other islands. After a civilian evacuation ends in tragedy most of non-combatants are forced to remain on the island. Many convert to soldier status. Tokyo sends mixed messages that squander time and resources, as when they order the defenders to build an airstrip for aircraft that never come. The truth soon becomes obvious: the high command decides that the island cannot be held and effectively abandons the Okinawan defenders. When the Americans land many troops are deployed in the wrong places. As the slaughter mounts, a suicidal attitude takes hold. Okinawa becomes a death trap, for civilian volunteers and non-combatants as well.

A group of Okinawan high school girls are drafted as nurses during the American invasion of the island. As the enemy army advances further, the situation for the girls becomes increasingly desperate as food and shelter run out and the number of injured climbs, leading to the film's tragic finale.