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While working as an FBI agent in the US as usual, Leo Jasper hears about the case of Guest. Guest is a boss running an organized crime syndicate in the US, but despite strong suspicions, there is no concrete evidence to arrest or deal with them. They always cleverly evade the law, and even when summoned for investigation, they willingly attend with a lawyer, provide plausible statements, and are released. Without physical evidence, even aggressive interrogation is impossible, making them difficult to catch. Guest's visible business is registered as a legal establishment, and no one knows what happens in the deepest parts of the building while everyone else is asleep. After receiving this case from his superiors, Leo Jasper accepted the mission and has been watching Guest's movements with a sniper rifle from the rooftop of a nearby high-rise building. However, due to the building's structure, nothing can be seen clearly, only faint black silhouettes moving. Leo Jasper eventually lowered his gun and reported a change of plan to his superiors. As soon as he received permission, he began working at Guest's establishment as an employee for an undercover investigation. However, due to Guest's thorough nature, he still has no results. BL Story