Maria†Holic

Kanako Miyamae transfers to Ame no Kisaki Catholic school, seeking a romantic relationship, a goal inspired by her parents' experience. However, due to her severe allergic reaction to men, she attends the all-girls school for a same-sex partner. Her first encounter is with Mariya Shidou, who appears to be the perfect match, but Kanako soon discovers Mariya is hiding a secret: he's a cross-dressing boy. Kanako and Mariya form an unlikely living arrangement, with Mariya agreeing to keep his true gender hidden in exchange for Kanako's discretion.