While playing soccer in the park, Conan, Mitsuhiko, Genta, Ayumi, and Haibara meet Komori Tomoko drinking wine alone. With tears streaming down her face, she confesses that her beloved boyfriend has passed away. Later, Tomoko takes the children to a botanical garden, where they meet Kajiki Kohei, the president of a men's cosmetics company. Tomoko and Kajiki hit it off, and the two begin dating. A few days later, Tomoko invites the children to her house to inform them of some exciting news. However, while ascending the stairs to the second-floor terrace, they hear a scream...