Azusa, once the wealthy daughter of a company president, suddenly finds herself in poverty due to unforeseen circumstances. After her final piano recital, she says goodbye to her teacher, Rin. Rin harbors a lesbian interest and visits Azusa at home, bringing her food and beginning to seduce her. Though initially hesitant, Azusa is gradually drawn in by Rin's aggressive advances and ultimately submits. From that moment on, their relationship takes a dramatic turn.