A Nameless Monster is the thirty-seventh episode of the anime.
Lotte starts asking questions and tells Nina that she feels that Edmund Fahren's and Richard Brown's suicide and Blue Sophie's death are somehow tied to Johan. Lotte informs Nina that Johan is at the book donation ceremony. Nina leaves after checking that she has a pistol in her bag.
At the ceremony, Tenma remembers when Johan killed Adolf Junkers and the Fortner's and Mr. Maurer's murder. Tenma is unable to shoot Johan. Roberto attacks Tenma from the back and grabs the sniper rifle to shoot Schuwald, but Tenma hits him back and prevents it.
Schuwald figures out Johan's plan and, during his speech, he instructs the attendees to the ceremony to slowly and calmly leave the place. One of Johan's accomplices starts a fire and people gets trapped inside the place.
With the fire spreading, Tenma and Roberto fight. Tenma grabs Roberto's gun and Roberto aims the sniper rifle to tenma. Then, a gunshot is heard.
- Roberto: "You're just a doctor. You can only give life. Taking life is my job."
- It is revealed in this episode that Nina knows Czech language, hinting that she might be Czech/Czech-born.