The story of "Adolf" begins in 1936 as Japanese reporter Sohei Toge travels to Berlin to cover the Berlin Olympic Games. Upon arriving, he finds that his younger brother, who has been studying in Germany as an international student, has been murdered and had connections with Communist organisations. Furthermore, all traces of information regarding his younger brother's study in Germany has vanished. Investigating the matter, he later learns that his brother's murder is connected to documents he mailed to Japan with information regarding Adolf Hitler. This information is crucial to the Third Reich as it contains proof that Adolf Hitler has Jewish blood.