Lotte has feelings for Schuwald's son, Karl, but lately, Karl has been busy working with his father, so he hasn't had any time for her. In the college library, Lotte meets Nina, who is doing research because she suspects that the recent events surrounding Schuwald are the work of her brother, Johan. Tenma tries to kill Johan in a forest.

After an unexpected incident, Johan is hospitalized but immediately released. Johan receives a threatening letter from the prostitute who was pretending to be Karl's mother. Tenma helps a girl working as an underworld doctor.