第23話: コンアンはクルーズ船の犯罪現場を分析した後、一郎が連続殺人犯であると推測する。

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Conan finds Gozo's crime scene strange and believes Takashi is being framed. The boat suddenly loses power and Ichiro, Gozo's grandson, is stabbed in the dark. After talking with the butler Kenji and searching the rooms for Takashi, Conan puts Kogoro to sleep. In both Gozo and Tatsuo's murders, the killer attempted to frame Takashi; first by leaving his flower near Gozo's crime scene, then unlocking the storage room allowing Takashi to escape after killing Tatsuo as he witnessed the suspect toss the first weapon into the sea. As for Ichiro, he never mentioned his attacker using a flashlight when he was attacked in the bathroom, prompting Conan to declare that not only did he stab himself, but he is also, in fact, Gozo and Tatsuo's killer. As evidence, Ichiro is an artist and carrying bread is common as it can be used as an eraser; he unintentionally dropped a bread crumb in a pool of Gozo's blood. Ichiro confesses; he is in love with his cousin Natsue, but Gozo rejected his proposal for marriage with her and humiliated him. Takashi tells Natsue he did indeed plan to avenge his father but ending up falling in love with her instead; he accepted a much better future with her over petty revenge. (Source: Wikipedia)