The story is set in modern Taiwan where the protagonist is a college student. Our theme is 'fantasy brought by menstruation'. Menstruation is a physiological condition that every woman experiences. The age of the protagonist is consistent with our own so that we can better understand her heart and personality. In Taiwan, menstruation is often seen with a sense of shame. Despite being a normal physiological phenomenon, we are always reluctant to face this fate which cannot be avoided. In this film, we have inserted many hints and images of menstrual concealment and have drawn a variety of associations.