Mireille resides at the grandfather's estate alongside Jean and Sylvia, who are compelled to labor there. With distinctive purple hair, she strategically proposes marriage to Jean amid his sexual involvements with other estate women like Sabine and Tina. She cites the master's illness and positions the union as Jean's path to inheriting the grandfather's wealth, framing it within a broader inheritance scheme.

Following the master's death during intercourse with Sylvia—which secures Jean's inheritance—Mireille resurfaces in alliance with Marianne, another estate resident. Marianne concedes their defeat in the inheritance contest, acknowledging Sylvia's concealed relationship with the grandfather as the cause. Despite this, Mireille and Marianne obtain an unspecified benefit from the estate before departing the mansion.