After the divorce, I took in my son's younger brother to raise. After my ex-husband passed away, the three of us reunited. This time, we decided to go on a trip together, but my younger brother couldn't make it due to scheduling issues, so it turned into a trip for just my older brother and me. Actually, my brother had started seeing me as a woman during the years we hadn't met… He had always liked Mom… He couldn't hold back any longer. Chisato had refused once before, but she gave in to her brother's intense passion and agreed to it just this one time… The intense pleasure made it impossible to stop at just once… A new forbidden relationship between parent and child begins.
