In a rural village in Thailand, Mak is sent to fight in a war and leaves his pregnant wife, Nak. Mak is injured and barely survives. He returns home to his doting wife and child, or so he thinks.

Based on a true historic figure, Yamada Nagamasa, a Japanese adventurer who went to Ayothaya in the 16th century and became a soldier in King Naresuan's army. After the war in Burma it's restless in Ayothaya, because of a mysterious group of men that terrorizes and plunders the city. Yamada goes after them and discovers that the men are rebelious Japanese samurai. Now he has to fight his own countrymen.