In her second year of marriage, housewife Rei Kuroshima lives a peaceful daily life with her husband, who works at a foreign company. However, when her husband is suddenly assigned to an overseas post, Rei decides to accompany him abroad. To prepare, she begins private English lessons. But as her husband's dishonest behavior shakes her emotionally, the temptation from her Black male instructor grows stronger. Caught between reason and desire, a whirlwind of cultural clash and uncontrollable lust begins to unfold.