Ammu is a school teacher, who is not fond of cats. But when her younger sister gets a male kitten as a birthday gift, she develops an affection for him. Instead of giving him a fancy name, she calls him Billu. Her fondness for the new member of the house grows day by day. But, God had some other plans for them. Based on true events, it’s a touching tale of affinity between Ammu and Billu.