A strange disease in which a man transforms into a woman's body,'acquired feminization'. To approach the mystery, I interviewed a former man who was alleged to have developed feminization. "I was a woman when I woke up one morning," he said. It looks completely female. The contents are a man. A physical examination revealed that her breasts remained small. However, when I checked the sensitivity of the nipple, a feminine voice suddenly leaked out, "Hmm ...!". This is interesting. It looks like we need to look into it.