Four brothers, Ilhom, Hasan, Qosim and Mahmudov, who have been at school for 30 years, meet and agree to meet again. One of them, Mahmudov, accidentally finds a book in the library. He brings it with his brothers to the next "sitting". The book tells about a dangerous game. The brothers, although they do not want to, open the book, and the game begins. The game could be played once a week, only on Thursdays. The first to play the game, Mahmudov, turns into a girl. The brothers are scared. What will happen to the rest? What else awaits the brothers in this dangerous game?