Two months after the events of the previous game, Susato Mikatoba learns that her best friend, Haori Murasame, has been accused of murdering Jezail Brett, the murderer of Dr. Watson. With no defense attorney willing to help, she decides to do so. However, since women aren't allowed in Japanese courts, she disguises herself as Ryūnosuke Naruhodō's cousin Ryutaro. Aided by her father, who never was sick, she discovers that Brett's true killer is Heita Mamemomi, a reporter who hated that she was to be judged in England instead of Japan. Unfortunately, with Brett's death, the reason for her murder of John Watson remains a mystery. Susato learns that the reason she was summoned back to Japan is connected to a case she previously worked on.