Roll The Dice - Celegiri and Saiouma

Kyoko Kirigiri is a world renowned detective. She's solved every case she's ever been assigned except one.

Her parent's murder.

When she finds clues connecting her parents murder and Celestia Ludenberg, a famous underground gambler and drug dealer, as well as a former assassin in the world's largest assassination organization in the world, D.I.C.E., Kyoko starts suspecting her.

She (reluctantly) teams up with Shuichi Saihara, a detective who's been chasing Kokichi Oma, leader of D.I.C.E., for years, and the detective's find themselves involved in the biggest chase of their careers.

---

TLDR;
Kyoko is chasing Celestia and Kokichi with the help of Shuichi because she suspects Celestia of her parents murder.

I suck at descriptions.

Criminal AU? Or would this be an Assassin AU? Idk.