Michika and her son and husband decided to go to a concert of the popular idol group "Puripleri Princess Z" this year. On the night before, when I was dancing a popular song of Princess Z with my son while looking forward to the concert, one phone call came to Michika. The owner of the phone was Kenichi, a younger sex friend whom I met at a part-time job. On the day of the concert, Michika took a provisional illness and broke her promise with her son and husband, bringing Kenichi to her home without anyone.