During the war, lieutenant Hashimoto and three other accomplices, buried a cache of morphine in an air-raid shelter under a military hospital and they agreed to meet again ten years later to dig out the treasure. On that day, five people show up, but Hashimoto originally had only three accomplices. He hid the morphine late at night, so they did not know each other's identities. There is one person too many in the group, but they do not know whom. In spite of all the doubts they have about each other, they decide to work together to find the treasure.