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Rino married as the wife of her eldest son, Yuichi. However, her mother-in-law did not recognize her daughter-in-law as a family member because she could not have children. When Yuichi goes on a business trip and is away from home, his senile father-in-law begins to touch his body, and his brother-in-law, who should have been kind, is also harassed at night. Rino, whose body has awakened as a woman even though she refuses, finally accepts her father-in-law. Her sister-in-law, Ayame, who had hated Rino for a long time, sees the whole story and gives her a disgraceful treatment.