Shimamura Hougetsu (島村 抱月 Shimamura Hōgetsu) is a high school student. She 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 instantly 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.
Shimamura has tail-bone length, dyed brown hair, which she keeps out of her face with two clips on the right side. Her eyes are also brown. Despite playing basketball in middle school, Shimamura is on the shorter side. She has a slim figure.