Black Widow Business(2019)

Black Widow Business is a Japanese drama series centered on a ruthless scheme in Osaka. Sayoko Takeuchi systematically targets wealthy elderly men, marrying them to claim their inheritances with help from Toru Kashiwagi, who operates a marriage agency. When Tomomi Nakase discovers her father has been hospitalized and secretly married to Sayoko, she becomes determined to stop the con. Tomomi hires private detective Yoshinori Honda to uncover the truth about Sayoko and Toru's operation. As the investigation deepens, Tomomi races against time to protect her father's fortune and expose the criminals behind the scheme.