Tuna is going through hard times due to the psychological illness he suffers from. He tries to cope with the problems he faces with the support of his best friend Berkin. Meanwhile, Tuna begins to develop an emotional connection with Selen, his neighbor and college friend. This unexpected romance causes the strong friendship between Berkin and Tuna to break down. The serial murders that begin to take place around him drag Tuna towards a dangerous process. Developments that negatively trigger her illness and a trauma he experienced in her childhood cause Tuna to experience complex psychoses. Tuna struggles with the strange games his mind plays on him, while trying to live the love he feels in his heart. He will also have to struggle with Berkin, whose presence turns her into a troubled friend.