Tantei Monogatari

A private detective and a college student find themselves in hot water while investigating the murder of a night club owner.

One night, impoverished private detective Tsujiyama Shuichi captures the decisive moment while conducting an adultery investigation. However, his luck turns sour when he gets into a scuffle with wealthy university student Arai Naomi, who mistakenly believes he’s taking upskirt photos of her. During their struggle, the camera’s SD card breaks, ruining his meal ticket and earning him his client’s fury.

Housekeeper Hasenuma Kimie, who has worked for Naomi’s family for years, visits Tsujiyama. She apologizes for Naomi’s rudeness while requesting his services as a bodyguard. With only five days until Naomi departs for New York to study abroad, she continues partying night after night. Additionally, her ex-boyfriend Miyoshi Toma has been stalking her. Tsujiyama ultimately accepts the five-day bodyguard assignment, thinking it’s an easy job as he begins accompanying the slightly impudent and tomboyish Naomi.

However, everything changes with a single phone call! The caller is Detective Takamine Kiyoto, who investigated a case with Tsujiyama six years ago when he was still a police officer. Shockingly, Tsujiyama’s ex-wife, Motomiya Sachiko, is suspected of murdering Yashiro Kazuya, the heir to Kunizaki Shigemichi, chairman of “Kunizaki Industries,” which is rumored to have yakuza connections. Furthermore, after divorcing Tsujiyama, Sachiko had romantic relationships with both Kunizaki and Kazuya!

While Tsujiyama remains skeptical, Sachiko is on the run, and the truth remains shrouded in darkness. Meanwhile, Kunizaki, seeking to kill the despised Sachiko, makes contact with Tsujiyama. When Naomi hears the full story from Tsujiyama, she becomes intensely curious and suggests they find the real culprit themselves to save Sachiko, whom Kunizaki now targets. Completely swept up in Naomi’s pace, Tsujiyama agrees to investigate the case’s truth together. Just then, a second murder occurs.