A.R.M story revolves across three timelines and involves the father and grandson and the startling happenings in their lives and how it impacted them and the society. Ajay, who is a government employee falls in love with beautiful girl Lekshmi, daughter of the influential person Chattutti Nambiar. However the people of Haripuram tease and brand Ajay as robber as his grandfather Maniyan was accused of stealing the precious idol from the temple in the village. What challenges Ajay faces and how it involves his mother Sarojam, Maniyan wife Manikyam, Sudev, SI Saifuddeen, Suresh and what is the connection to great warrior Kujikelu, his lover Jyothi, Edakkal King Mana Varma from the interesting twists and turns.