Pavithran is a stubborn man who works as Caretaker of a residential apartment & doubles as night security guard for an extra income. His landlord Mariayamma rents out his house to a stranger who will share his home when he is at work. He sets out to annoy his roommate but later discovers that his roommate is a woman & this adds colour to his very plain life. They start to exchange notes everyday but the journey to find who the mysterious roommate ends up in humorous moments & twists.