Acting on a tip off, a police team led by Training Deputy Superintendent of Police Renu Krishna raided the restaurant in Nawada area of the Ara town.
A total of 15 girls and 16 youths caught in uncompromising condition were taken into custody from the spot, the DSP said.
Owner of the Restaurant and two employees have been arrested in this connection, she said.
The girls have been sent to women help line, she said.