The film Innanu Aa Kalyanam is set in the backdrop of a family and campus. Sundaresan is a cunning fellow and his son Kunjumon too shows the character of his father. Neelima is his classmate. But she hates Kunjumon as he misbehaved once. Her father Sulochanan Pillai is a rich man. Aysha and Karthik are friends of Neelima. Meanwhile, Sulochanan Pillai wished a marriage alliance with Chris, a Malayali born and brought up in Germany, for Neelima.
Roshan is playing Kunjumon in Innanu Aa Kalyanam, while Jagathy Sreekumar and Bindu Panicker appear as his father Sundaresan and mother Suseela. Malarvadi fame Malavika is reprising the role of Neelima and Saikumar plays Sulochanan Pillai. Rohini, Suraj Venjaramood, Indrans, Maniyan Pillai Raju, Mamu Koya, Narayanan Nair, Amba, Kalpana are supporting them.
Besides direction Rajasenan has also written the story and dialogues and Badharuddin has penned the screenplay for Innanu Aa Kalyaanam. Bijibal is composing the music for Vayalar Sarat Chandra Varma's lyrics.