Stalking Love Secrets of Me ~Forbidden Romance~

Having unrequited love for Yamada Ichiro, the protagonist decides to get plastic surgery in order to attract his attention.
By chance, a detective teaches her the fundamentals of covert investigation.
With her new skills, she discovers that Ichiro is actually a con artist who tricks women into marrying him.
As she becomes depressed, all sorts of cute guys come into her life...
She then finds a new goal for herself: to steal them away from their girlfriends. What will become of the protagonist as she wholeheartedly stalks these handsome men?!

[From Steam]