Matsu Kamatani, born January 1st in Kashiwa City, Chiba Prefecture, stands 176 cm tall and weighs 48 kg with blood type B. Academically excelling in all subjects except English, she actively participates in her school's kendo club. As the only daughter of the Zaibatsu Kamatani family, her serious personality manifests through her role as class president. Despite these attributes, an intangible quality remains absent from her character, all while maintaining a distinct "ojosama" demeanor.