KM Anandhan is a father of two kids; one daughter Sandhya and a son. He turns anti-religion as he lost his wife, and accuses that god has failed him and in return he looses his belief in god. Sandhya falls in love with the film's villain's son. They continue their affair in secret until his father gets to know.
Meanwhile, the villain consults an astrologist to find a way to earn quickly as possible so that he purchase a granite quarry. The astrologist then says that if he offers a virgin girl life to the gods, then he will be able to attain the gold which buried beneath the Mecheri Vana Bhathrakali Amman's statue.
As the villain detests Sandhya for falling in love with his son, he kidnaps her and kills her as an offering to the gods. Yet, the very next day Vana Bhathrakali Amman will be under the disguise of Sandhya an can be spotted at her home doing her daily chores as usual. The rest of the plot revolves around how Sandhya gets her revenge on the villain.
All the above mentioned characters has delivered a over the top dramatic, and a poor performance. KM Anandhan has attempted to make a devotional movie with an age old script, but has completely failed to keep the audience hooked to the story as the screenplay is boring, old and has nothing new or refreshing to offer. Aadhish Uthriyan has composed the music and his background score justifies the movie's genre with all the usual devotional tunes.
In short, Mecheri Vana Bhathrakali, will make you turn into a Bhathrakali.