Matsuno is Hayami's homeroom teacher, she is also the one who administered his "entry exam" in the first episode. When it comes to Reina and Reona Matsuno is practically spineless and follows their orders, until the fourth episode when she fails to hold her self back and rapes Takuro, after which she is gang banged as a punishment for doing so by Reina. After that she is not seen nor mentioned again.