Conan, Kogoro, and Ran pass by a woman named Kyouko Takahata who passes out upon receiving a phone call that her brother-in-law, Itsurou Soejima was found dead in her home. They head to her house along with the police to discover that the drunk Soejima died when he fired a shotgun toward the ceiling, which caused a chandelier to fall on top of him.
The police conclude it's suicide, however Conan believes it was a carefully planned murder. Conan investigates and discovers that in half a year, there were nine incidents where Soejima almost died due to his alcoholism and that Kyouko was involved in all nine incidents. After gathering the evidence, Conan gathers Kogoro, the police and Kyouko and tranquilizes Kogoro to reveal his deductions.
Conan reveals that Takahata called Soejima to her home and had prepared the alcohol and shotgun to tempt Soejima, who is a recovering alcoholic. As evidence, Conan reveals that a piece of her nail was found in Soejima's house and that she was searching for his cellphone which evidenced that she called him to her place.
Kyouko confesses and reveals that she killed Soejima because she was sure that he caused the death of hee beloved sister. Conan reveals that a message from her sister's phone reveals she died of an illness and that she loved Soejima very much, and Kyouko has a breakdown over said revelation.
