Mizutani Shieri, 32 years old. She lives with her husband and son, but her husband is frequently away on business, returning only about twice a month. As a result, she spends most of her time alone with her son. Recently, she noticed a slight odor coming from her son's underwear and began to worry, wondering if he might be uncircumcised. With her husband absent, she finds herself thinking more and more about her son's body. Regretting that her husband isn't around when she needs him, she becomes increasingly aware of her son's physical changes and can't help but feel deeply intrigued.