"It's not a different story, but has a message of a social cause in it. It is a human drama with an emotional element," the actor said here on Tuesday at the Dadasaheb Phalke Film Foundation Awards.
"It is not an 'out-of-the box' story but it is a beautiful story and I feel lucky to be a part of it," he added.
"Aligarh" is reportedly based on the real life incident of Shrinivas Ramchandra Siras, a doctor who was terminated from his job because of his sexuality.
In the film, actor Manoj Bajpayee plays Siras, and Rakummar says he had a "great experience" working with him.
"It was a great experience. He (Manoj Bajpayee) is great artist and a great human being as well. I have always looked up to him," the National Award winner said.
For Rajkummar, Bajpayee's work has been a learning experience.
"His work has always been a learning process for me and now that we are working together, I'm learning a lot from him."