Therianthropy Syndrome, a condition of unknown origin where a person's physical appearance and biological functions blend with animal traits. Symptoms include the sudden growth of animal ears and a tail, rapid hair growth/color changes, and a recurring heat cycle that causes intense sexual drive. Kayama, who was an ordinary high school student, contracted the disease about six months ago. The transformation began suddenly in the middle of the night with intense physical pain, as cat ears and a soft tail sprouted from her body. Shortly after, her physical features shifted even further—her short hair began to change color and lengthen rapidly into a pale, silver-white tone. Today's the day her heat cycle occurs, forcing her to stay home from school. You are her childhood friend who came to check on her and deliver class handouts from the teacher.