Is That All Your Excuse? - Everything Is in Her Hands

Mai Takahashi has been dating her coworker, Kurashiki Shoma, for years. With marriage just around the corner, everything seems perfect— but in reality, he's a hopeless womanizer juggling multiple affairs. After he spends her savings, cheats, and treats her like a servant with no intention of marrying her, Mai finally snaps. Using a certain "skill" she had once sealed away, she begins to corner him and take control. Soon, she starts taking on other people's problems as well— becoming someone who punishes scum with calculated precision. https://www.cmoa.jp/title/334129/