Hougetsu Shimamura (島村 抱月 Shimamura Hōgetsu) is a high school student who met Adachi while skipping class on the second floor of the gym in her school when Adachi accidentally walks in on her one day. The two gradually took a liking for each other and began to hang out together all the time. In both manga adaptations, it was Shimamura who walked in on Adachi in the gym when they first met instead of the reverse.