Ai, who attends an all-girls school, a paradise for lesbians, is familiar with lesbianism. After being dumped by her boyfriend, she starts to look at women as potential love interests, and is enamoured by the mature sex appeal of her homeroom teacher, Yuu, and falls in love with her, confessing her feelings to her. Yuu teaches Yuu her first lesson in how to love with another woman. It is both gentle and passionate. Their forbidden relationship burns brightly...