The husband passed away a long time ago, leaving only the mother and son to take care of each other. When the son got married, the family atmosphere somewhat improved. However, since he got married, the relationships in the empty house without the father began to become more complicated. They often heard and witnessed scenes of the two children engaging in sexual relations, desires that used to belong to the mother alone, Mako Oda. This happened many times until the desire reached its peak. Unable to control her emotions, she took advantage of her daughter-in-law being away and had sex with her own son to satisfy her physical needs. The son somewhat understood his mother's suffering, and her large breasts and sexual skills were too attractive to resist, so he accepted this situation as natural.