While her husband is away on business, Tomoe Shiraiwa notices strange changes in her father-in-law, Eiichi, as his dementia worsens. Though he just ate breakfast, he demands more food; when he goes outside, he harasses strangers, and eventually starts calling Tomoe "Yukiko." As the elderly siblings descend into dementia-driven chaos, Tomoe, a big-titted married woman, becomes trapped in relentless old-man rape sessions, falling into utter degradation. A documentary-style story depicting the breakdown caused by dementia and the shifting dynamics within the family.