Kumiyama Shigeno, an 18-year-old detective agency member, stands at 160 cm with a slender frame marked by 78-53-77 cm measurements. Born on December 19, she serves as the younger sister of Shizuto Kumiyama, sharing professional ties with colleagues Tomoe Kanose and Chizuru Higaki. Two years following Mikagura Tokito’s unexplained vanishing, a letter from her brother propels Shigeno and her team to embark on a pivotal investigation in Dalian, reigniting the search for Tokito.