Shiho, who lives with her husband and father-in-law, is having trouble conceiving with her husband, and the relationship between the couple is gradually becoming strained. Shiho gradually starts wearing flashy clothes due to the stress, and even when caring for her father-in-law, she starts to look sexy. Her father-in-law is surprised by Shiho's excitement, but gets an erection... Seeing this, Shiho instinctively asks for pregnancy sex with her father-in-law.