The head of the Kendo Club. Unyielding and masculine, she and Ren share a rather masochistic relationship. Unlike the infamous Ren, Kasumi is cheerful and sociable, her fame further amplified by her national-level fencing skills. She has a generally rough personality, but when it comes to Ren, she's prone to worrying and being fussy. She has a tendency to try and act the older sister from time to time, but she neither looks, nor feels the part.