The Wakabayashi family's daily life has always been simple and modest. Father Akira suffers from a chronic illness, and together with his son Masashi, they struggle to get by on a meager income. Eventually, they are forced to give up their home. After years of enduring illness, Akira unleashes his pent-up frustration on Masashi, demanding that his immobile lower body be cleaned using Masashi's own tongue—a harsh and degrading decision.