Koyomi has always lived a serious life. When she visits her cousin, a gynecologist, for menstrual problems, she is given the unexpected suggestion of "egg freezing." She makes a big decision and starts egg freezing treatment, but perhaps due to the effects of hormones, she begins to experience strange sensations of being attracted to the opposite sex...!? The bright and positive new Koyomi encounters various men through experiences that Koyomi would never have imagined, such as "matching apps" and "female brothels" ...!?