Ryouko Kurosaki

A strange girl who is after the power hidden in Sanpeita. She carries a sword around and is not hesitant about using it. She is employed at Mishima, Ryoko is often seen with her black cat. She is also a classmate of Sanpeita Kobayashi, and although she had been registered with the school from the time she entered, she had not attended school until now, and was called a "legendary classmate. After the appearance of Kemeko, she has been coming to school to watch over Sanpeita, but she skips most of her classes and treats Sanpeita as a passive assistant. She is a swordsmith who wields her beloved sword "Masamune" and competes with Kemeko on an equal footing. At first glance, she seems cool, but in fact he is a compassionate person, and she ends up helping Kemeko and her friends.