Tsubaki Mapputatsu

Tsubaki is a miko swordswoman. Her sword can cut anything but nata de coco. She was hired by the yakuza boss in order avenge his earlier defeat at Mamoru's hands. After finding out the truth about the yakuza boss and realizing she had been tricked, she exacts her revenge on him. She also decides to enter Mamoru's school to become more worldly. After Mamoru cheers her up when she was depressed about being old-fashioned, she develops feelings for him.