School: Millennium Science School Club: Special Phenomena Investigation Team (Dual membership with Game Development Department) Grade: 1st Year Age: ?? Birthday: March 25 Height: 152cm Hobbies: Taking care of Aris, fashion, gaming (denies it) Kei is the name newly acquired along with a humanoid body by the AI "Key," a key figure in the story surrounding Millennium Science School. Her appearance is like a horizontally flipped and color-inverted version of Aris. Her halo is the same shape as Aris's, just like when she was in the AMAS body, but flipped and pink. The clear differences are her hair length and the large black ribbon on the back. She has long hair, but unlike Aris, it doesn't drag on the ground. Her voice quality is the same as Aris's, but with a slightly lower, stronger, and more detached tone. Although her body is artificial and could be called an android like Aris, she is emotionally rich with few mechanical elements. Her daily life is no different from a normal human, and she usually lives in the Millennium dormitory.