在这部发光石头剧情片中,阿牛自小無家，所以愛偷看別人的家，因此遇上在床底生活的阿海。
阿海疼愛阿妹，由于父母很早離世，兩人被福利署人員帶走。后來阿妹被收養，五年后漸漸融入新家庭，而阿海仍然過著躲昵生活。
一天，阿海偷偷探望阿妹時，養母突然回家，情急之下阿海被推到床底，並開始阿妹的床底生活。此后兄妹變得不尋常，阿妹想為哥哥生孩子，阿牛揭穿了這個秘密、改變他們一生……
May and her brother are inseparable as children. When May becomes an adolescent, she can't seem to let go of memories of her childhood, which seem to sustain her in her cold, loveless middle class home in Diamond Hill.
《發光石頭》的亂倫。
