Nazuna Nanakusa was originally a human high school student and Michiru Kagemori's close friend. An accidental transfusion of beastman blood during a hospital stay transformed her into a kitsune beastman, an experience she initially shared with Michiru. Government agents subsequently took Nazuna to a research lab for study.

Boris Cliff, a snake beastman and head priest of the Silver Wolf Order cult, later rescued her. Recognizing Nazuna's potential, Cliff rigorously trained her, honing her innate abilities and imparting all his knowledge. Under his guidance, she became the cult's guru, adopting the alias Déesse Louve and altering her appearance to match the legendary Silver Wolf, Ginrou. In this role, she manipulated followers while believing she aided beastmankind.

Through structured training, Nazuna mastered transformation into her fox-like beastman form and developed kitsune abilities including illusion creation, physical appearance alteration, and energy projection, becoming central to the cult's operations.

Her motivations changed when she uncovered the truth behind Alan Sylvasta's plans. Alan, president of Sylvasta Pharmaceuticals and a pureblood beastman, exploited Nazuna to advance his scheme: inducing Nirvasyl Syndrome—a condition causing beastmen to go berserk—across Anima City. He intended to use a "cure" to forcibly humanize affected beastmen, masking his goal to eliminate those he deemed impure. Nazuna discovered that her blood, combined with Michiru's, held the key to curing the syndrome.

This revelation drove Nazuna to rebel against Alan and the cult. She reconciled with Michiru, and together they thwarted Alan's plan during Anima City's crisis. Following these events, Nazuna embraced her beastman nature, choosing to stay in Anima City without seeking a return to humanity. Her relationship with Michiru evolved into a renewed alliance focused on protecting the city and its inhabitants.