Yamauchi Kumiko is a 50-year-old housewife. In truth, there's a hidden relationship between us—a mother and son bond that has continued for many years. I've repeatedly promised myself, "This will be the last time," "It has to end here," yet whenever my son affectionately draws near, my heart wavers uncontrollably. Each time, though I try to reason with myself, I inevitably end up giving in and sleeping with him again. Tonight, just like before, as I was soaking in the bath, my son appeared before me. Wrapped in warmth and comfort, this forbidden relationship continues to teeter on the edge of morality.