Japan, 1944. Trained for intelligence work, Hiroo Onoda, 22 years old, discovers a philosophy contrary to the official line: no suicide, no giving up, the mission is more important than anything else. Sent to Lubang, a small island in the Philippines where the Americans are about to land, his role will be to wage a guerrilla war until the return of the Japanese troops. The Empire will surrender a year later, Onoda 10,000 days later.