"Please forgive me, but I cannot yet become a servant of the Lord," Maria says as she flees from her vows ceremony at the convent where she spent the last sixteen years. Just as she receives another letter from her enigmatic benefactor "G," Maria realizes that she is not as alone in the world as she had thought. According to the letter, she has a relative who desperately needs her guidance and is currently attending Hakuhou Academy. However, "G" is unable to disclose the relative's name. Maria decides to enroll in the school and search for her kin, but she faces several obstacles - most notably, that Hakuhou is an all-boys academy!