Seisa is the representative of the Going-Home Club, and the granddaughter of Mikagura Academy's principal. Seisa is a second-year at school, and is a hikikomori. She was once a member of the Art Club, and was known to possess the strongest power in the school. The Going-Home Club is not actually registered in the school, and does not participate in battles. Her ability is known as "Killing Art", which allows her to reshape space by her will.