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Monster is an mystery story, set in Germany, about a Japanese surgeon named Doctor Kenzou Tenma, trying to undo a big mistake, and prove his innocence. Years after performing a life-saving operation on a young boy instead of the mayor, Tenma soon discovers that the boy he saved, Johan, is a manipulative psychotic killer who will stop at nothing to create the world he envisions in his twisted mind. Soon, Doctor Tenma finds himself the prime suspect for the numerous murders Johan has committed.
After initially believing that Tenma set the fire in the library, Runge tries to question Schuwald. Karl tries to convince Runge to search for Johan (as Johan has not been seen since the ceremony), making Runge believe that Johan is indeed real. Nina leaves the hospital and undergoes psychological therapy with Dr. Reichwein and Dr. Gillen. Afterwards she decides to leave for Prague to find out the truth about her dreams and Dieter decides to leave with her. Schuwald, through Karl, sends Tenma a message: the mother of the twins may be alive and living in Prague.
After a brief gunfight, Roberto is shot twice and falls over the balcony, apparently to his death. Tenma decides to help the people trapped in the library by shooting out the doors. He tries to and yet again is unable to kill Johan. Both Nina, who sneaked into the donation ceremony, and Schuwald are injured in the fire. Meanwhile, Karl finds out about his origins at Schuwald's residence.
Nina reads the book that Lotte found and begins to recall some memories. She then decides to confront Johan at the book donation ceremony. During the book donation ceremony, Tenma finds himself unable to kill Johan and is confronted by Roberto. But before Roberto can kill Schuwald, a fire set by one of Johan's henchmen engulfs the library. Tenma manages to grab a handgun and points it at Roberto.
Dr. Reichwein confronts Schuwald about his suspicions about Johan but is rebuffed. Reichwein is able to determine that Schuwald is Johan's next target. Dr. Gillen pleads with Runge to find Johan and arrest him, but Runge rebuffs him, believing that Johan is a figment of Tenma's imagination. Runge also believes Schuwald to be Tenma's next target. Lotte confronts Nina about the book that made Johan collapse.
Runge questions Tenma's former friends from Japan to know more about his suspect. One of them has the book Johan is apparently looking for, which Runge examines. Dr. Reichwein confronts the "foster parents" of Johan and suspect they are not who they appear to be. Tenma sneaks into the library the night before the book donation ceremony is to begin.