Dai Qing is 31 years old and has been married for 7 years. She is originally from Setagaya Ward. Her husband is 20 years older than her and is now 51 years old, so perhaps because he is worried about his younger wife, he is very controlling and does not allow her to go out and have fun. She only feels free when she goes shopping by bicycle. Naturally, due to her age, she does not have much sex with her husband, and she is reminded of the intense doggy style she had with her ex-boyfriend, a volleyball player, when she was a student. She wants to have intense sex again... and she applied out of a sense of rebellion against her controlling husband.