Trapped in world of loneliness, School Teacher is a story of Mary who craves for love and lust and could go to any lengths to satisfy her needs.

Mary, who has been spending her life away from husband Danny who is a busy business man, decides to find attention and fulfill her physical needs away from the bond of marriage. She gets attracted to the illiterate Shyam and takes it upon herself to educate him. However soon, she also starts using him as her puppet for sexual desires. Soon, Danny asks for Shyam's help to murder his wife and one day, Shyam finds himself behind bars after he is accused of Mary's murder. But is Shyam really the killer?