Chitose is Kazuya's aunt who is married and lives in Kansai. One time, Chitose had to attend a wedding of old colleagues in Kashiya, so she stayed at Kazuya's house. The elegant and superior beauty of his aunt made Kazuya's little boy stand up, and he imagined the scene of doing that with her. And that night, when she came home drunk, Kazuya could no longer hold back and did something forbidden with his aunt...