Kikuzo, evicted from her apartment and with nowhere else to go, reluctantly visits her son and his wife, Shoko. After years of estrangement, it's the first time she's seen her son in a long time, but thanks to Shoko's kind support, Kikuzo moves in with them despite the awkwardness. However, Kikuzo fails to acknowledge the physical and emotional changes that come with age. She becomes increasingly fixated on Shoko's body, and as they continue living under the same roof, uncontrollable desires begin to stir within her. One day, ignoring Shoko's clear boundaries, Kikuzo acts on her impulses to satisfy her own cravings. In an instant, the family's fragile harmony collapses completely.