Newlyweds Tomomi and Kazuya find their relationship strained as Kazuya's relentless pursuit of sex, driven by their desire for a child, leaves her bewildered. Though seemingly demure, Tomomi harbored a surprisingly active past even before marriage. Kazuya is shocked by this revelation, and his confusion deepens when they progress into a threesome. Weeks later, Tomomi becomes pregnant, marking a pivotal turning point in their marriage.