Ayu, a schoolgirl, looks stunning in her sailor uniform, and her daily commute fills her with motivation for the day ahead. Living together and even engaged to a transgender woman she met through a telephone club, Ayu's life takes an unexpected turn when her homeroom teacher lays eyes on her. Watching over her as his student, he becomes deeply smitten by her appearance and earnestly proposes marriage. However, the teacher mistakenly assumes her transgender partner is her father and formally greets him for permission, leading to an adorable misunderstanding.