The king cobra possesses an orb that has a magic. If it's in the hands of the devil, Orb will have the power of evil. But if it's in the hands of a good person, it will have virtue. In the village of 'Phaya Ngu'​, there is a sacred orb worshiping ceremony, But the ceremony was destroyed by the devil, They had taken the orb and did evil things. A child and a young woman are captured and killed, so an investigation is underway to find out what happened and get the orb back.

故事讲述了十八世纪暹罗军压境进犯，大城王朝岌岌可危。小小村庄的Bangrajan人民螳臂挡车，多番力抗强敌大军……

故事發生於一個偏僻的泰國小鎮，妮無意中在森林認識了一位蛇仙，與他的感情迅即發展起來，而且她更阻瞞丈夫從蛇仙有了身孕。但事件東窗事發，妮的丈夫烈怒下殺了妮及蛇仙。但是，妮肚中的身孕其中一條小蛇幸運地逃走掉，更獲高人領養至長大成人。長大後的蛇女漂亮動人，更與一個俊碩的男子一見鍾情，發展了一段人蛇之戀...。

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.