Premachandran, a talented carpenter with a straightforward life, finds himself drawn into an unexpected journey when he helps a young woman, Kanmani, escape an abusive household. Disguised as a boy to avoid detection, Kanmani begins working alongside Premachandran, leading to humorous situations and a blossoming friendship. As her true identity and tragic past come to light, Premachandran is faced with the challenge of protecting Kanmani while navigating his own feelings for her. Rasathanthram is a poignant blend of romance, humor, and social commentary, highlighting the power of love and compassion in overcoming life’s adversities.