Rin has been watching over her son's healthy growth. - He overcame his rebellious period, was able to study, and has a good friend, Takeshi. - One day, Takeshi came to visit my house for the first time in a while. - Takeshi, who has been in love with Rin for a long time, ends up taking advantage of Rin's weakness. - Threatened by Takeshi, who has let the feelings he had cultivated over the years run wild, Rin offers herself to him...