Katyusha Bosch

In Rance X, Katyusha Bosch is the head of the DX association. She was bribed by Great Monster General Pizarro and attempted to control Rance by providing sexual slaves to serve him. Eventually she invited Rance to a meeting with the Dark Lord Lei, and tried to persuade him to betray humans and join the demons. She tried to trick Rance into signing a magical contract that would force the agreement upon the signatory. However, Rance had long spotted the trickery by her thanks to the help of Crane, and instead of turned the trap on its head, and greatly injured Lei during the meeting.

Bosch tried to escape, but was eventually stopped by Kanami, Biscuit and Freya. She ended up tasting her own medicine by signing the magical contract to forever obey Rance's commands instead.