Takeshi Shinonome, private detective, meets a young woman named Ayumu one rainy night. Her sister Marie went to the same high school as Takeshi, and Ayumu needs his help: she wants to know if her husband is cheating on her. Takeshi finds evidence of an affair with a woman named Ako Sonomura. Then Ayumu's politician father contacts him — he's worried about a scandal ahead of the upcoming general election and wants Takeshi to investigate his daughter's private life instead. Before long, someone puts Ayumu in direct danger. A new drug keeps appearing at the edges of multiple murders, but there is never quite enough evidence to tie it all together. Whether the beautiful women Takeshi encounters along the way will help him untangle the truth remains to be seen.