Seiko is a student of Kisaragi Academy Senior High School's classroom 2-9 and a victim of Heavenly Host, and she is the older sister of Yuu Shinohara, Kei Shinohara, and Aya Shinohara.

[Dark Version]

Seiko felt more radiation and more fully dangerous... after the manslaughter of her friends... due to a tall black creature with white eyes and a suit...seiko now felt on the right path

[Her personality: loud,dangerous,shy,nervous,cocky,Vengful,rage,manipulator,remorseless sad,alone,sad,sadist