3 months ago, 24-year-old Kaoru Sasamori, who hired Kogoro to investigate her boyfriend, fell down the stairs and died. At her funeral, Kaoru's brother accused her boyfriend Tsuge of pushing her down the stairs. In present day, Kogoro is summoned by Tsuge with the message, "Come and I'll tell you about her murderer". Kaoru's brother, her best friend Kazumi, and Tsuge's manager all show up at the same time. They find Tsuge bludgeoned to death in his workshop.