Stalker Shikkaku

When a woman is found murdered and dismembered, the investigation is led by Shingo Tonokawa, deputy chief of the Musashigawa Police Department. He is married to the daughter of a high-ranking police commander, a career bureaucrat on an elite career path. He is the envy of everyone, but behind the scenes he has another face...

He is a "stalker."

Unable to forget his former lover, he can't resist the urge to find women who resemble her and stalk them. When he meets a woman named Mio, his life begins to unravel......

(Source: Nihonbungeisha, translated)