Shiori is a female student who is dating her teacher, Takuma, and has made a promise to marry him after graduation. During her last summer vacation as a student, Shiori comes to Takuma's family home. There, Takuma's uncle and cousins, including the elder Shinichi, are constantly coming and going. She thought this was the kind of family interaction that is typical of the countryside, but... this village is a hellish land where the lewd custom of all the relatives 'tasting' the woman who will become her bride is rampant! Shiori's body is played with in various ways. Before she knows it, her masochistic nature blossoms, and she begins to desire lewd acts herself...