The film begins in a modern heaven where Lord Paramasivan (Subbu Panchu) gives orders to Narada (Manobala) to pick four people for his Thiruvilaiyadal. The candidates picked are Ramarajan (Jai (actor)), a Siddha doctor; Ganesh (VTV Ganesh), a helpless man who is the husband of a local female don; Gopi (Sathyan Sivakumar), a future politician and son of a selfish politician; and Krishna (Rajkumar (Tamil actor)), a budding actor. Paramasivan and Narada see all the four's routines and premises. Ramarajan falls in love with a singer Jayshree (Niveda Thomas) and wins her heart. Engaged for marriage after 26 days, the quartet plans to fix a bachelor party at Bangkok. When they reach Bangkok, they enjoy it and flirt with girls at the party. They are drunk, and when they wake up, they find themselves abandoned in a tropical island in Bangkok. They try many ways to escape but are unsuccessful. Six months have elapsed, and Paramasivan gives them a final chance, which is a motorboat of pirates arriving to explore the island. The quartet begs them to take them to Chennai, but they refuse to help them and flee, but the quartet fights them back and escapes the island in the boat, abandoning the pirates on the island. After reaching Chennai, they have a happy ending except Gopi. Ramarajan finds out about Jayshree's marriage, so he goes to the marriage and finally marries Jayshree, implying the groom as an American software engineering and tells him to marry another girl by wishing him all the best. In a post-credits scene, the film mentions making-of.