The Cellhouse Kingmaker's Playbook

Story

Mint Limnades has clawed her way to the top of Niflheim Prison––a brutal, lawless jungle where only the strongest survive. Now the undisputed boss of the block, she’s offered freedom by the warden in exchange for one last job: turn the handsome, wide-eyed newcomer, Helios, into the next leader. The catch? She has to go undercover in a men’s prison. Will this kingmaker succeed in shaping her lost lamb into a boss, or are they both doomed to be crushed by the savagery of prison hierarchy?

Synopsis via AniList (English).