Titled "Ami Sairabanu" (no allusion to famed actress Saira Banu), the film will be the first in the Bengali film history to deal with the community which remains on the periphery of society.
The actor said he had actually mingled with eunuchs in Mumbai to get into the skin of the character and get acquainted with how they go about their daily lives.
"I have been talking to many eunuchs in Mumbai even before I got the script. I started observing them and picked up their mannerism and their dialect. I mixed with them to know the inside story of their lives," Raj told PTI here.
He said his attitude to the eunuchs underwent a tectonic shift when once during a ad shoot in Mumbai he was introduced to some of them.
Despite their apparent happiness, the community in general suffered from a sense of insecurity, he said.
"What I feel about them is that they make a conscious effort to mask their sorrows and pain," Raj observed.
Asked how he delivered his Bengali lines, the actor, also known for his role in "Love, sex or Dhoka", said, "I am comfortable with the language. I have learnt Bengali from a close friend with whom I often converse." MORE