Midnight Panther (ミッドナイトパンサー, Middonaito Pansā) is the name of a hentai manga created by Yu Asagiri, which later spawned an OVA.
Taking place in a post-apocalyptic fantasy world, this is the story about three beautiful, young females named Sonya, Kei, and Lukish.
They are in an extremely popular girl band called The Pussy Cats which is managed by an old hag.
In actuality, the girls are the notorious female assassins known as The Midnight Panther, who will kill men for money by first sleeping with them and executing them in their own unique manner.
However, when the girls receive a commission to kill the despotic king who is murdering his subjects, one of them takes the job personally and requests the honor.