Private detective Rinko was conducting surveillance on Ryu Shohi, a high-ranking member of the yakuza group "Sousoukai." Her investigation aimed to track his daily routines and movements, but one day, as she broke into his private quarters to gather evidence, she suddenly sensed a deadly presence behind her. In an instant, a gun was pointed at her, wielded by Ryu Shohi's mistress, Satomi—better known as Youko. This intense confrontation not only threatened Rinko's life but also marked a major turning point in her career as a detective.