Two months after the events of the previous game, Susato Mikotoba learns that her best friend, Rei Membami, has been accused of murdering the murderer of Dr. Wilson. 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 Ryunosuke Naruhodo's cousin Ryutaro. Later, Ryunosuke and Susato become involved in a conspiracy in the United Kingdom.