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It was Shiro who gave birth when Yukie was 25 years old. Raised by a single woman, Shiro continued to work part-time even after graduating from college, and did not show any signs of employment. Shiro wasn't a woman, and on the contrary, she never brought her friends. That should be the case, because Shiro had sexual feelings for his mother, Yukie. Yukie, who noticed it, invited Shiro to a hot spring trip to talk with her stomach.