As usual, the detective passed the time in the familiar bar when he came to work. The client is the detective's assistant, Takada's younger brother. His girlfriend Reiko is missing. The detective agreed to help find her, and he found that Reiko not only signed up as a model for a firm called Pure Heart, but also worked part-time in a place with a bad reputation. In the course of the investigation, they met Ma Li, the boss of Lingzi's part-time place. Soon, Mari reappeared in the company of two strong men. She learned that detectives and assistants were investigating everywhere, so she beat them black and blue. In spite of this, the detective did not flinch and continued his investigation. He learned that the director of Pure Heart was a mysterious figure named Beitiao, and that the Beitiao Group he owned was one of the largest groups in Sapporo.
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