Long time ago, A holy monk on pilgrimage has brought the spirit of a 10-year-old deposited him at abandoned temple, Sichon district of Nakorn Si Thammarat. His order to the boy was "watch over this place until a virtuous man arrives".

Nava, a brilliant botany student, searches for the origin of a plant called "Chalawan", and to do so he organizes a team of friends to travel through the jungle. There, they encounter a huge man-eating crocodile.