Asuka is reduced to a catatonic state by her depression and Kaworu Nagisa replaces her as pilot of Unit-02. Kaworu, who initially befriends Shinji, is soon revealed to be the final Angel. Kaworu fights Shinji, then realizes that he must die if humanity is to thrive and asks Shinji to kill him. Shinji hesitates, then kills Kaworu. This act triggers the forced evolution of humanity, termed the "Human Instrumentality Project", in which the souls of all mankind are merged into one. In the final scenes of the last episode, Shinji's soul mentally grapples with the reason for his existence and reaches an epiphany, enabling him to destroy the wall of negative attitudes and emotions that tormented him throughout the series. The episode ends with all the characters applauding him, as Shinji smiles and thanks everyone.