Ivy, a confident and meticulous high school student, faces a sudden twist when her period arrives unexpectedly on the day of a crucial math quiz. Frantically rushing to the bathroom, she discovers the pad dispenser is empty, forcing her to improvise with a makeshift toilet paper pad. Ivy's world turns into a whirlwind of paranoia as she struggles to preserve her flawless image among her classmates, all the while concealing the challenges of "shark week."