Madam is a Magical Girl(2005)

Madam is a Magical Girl is a series that follows Ureshiko Asaba, a 26-year-old married woman living a double life as Agnes, the magical girl guardian of her town. When Sayaka Kurenai, another magical girl sent by the magic realm as her official successor, arrives with orders to destroy the entire town and rebuild it from scratch, Ureshiko refuses to step aside. Caught between duty and desire, she navigates a crumbling marriage to her husband Tamotsu, growing feelings for Tatsumi Kagura—a young tenant in her home—and a devastating curse: one kiss with an ordinary human will strip away her powers forever. The series balances magical girl action with the complicated realities of adult life, exploring what it costs to protect those you love.