Kei managed to find a body similar to the Decagrammaton trio, locked in the inner depths of Netzach, which makes her the hybrid of the Nameless Priests and Decagrammaton technologies.
Although the game initially did not register her as such, she received the full name of Tendou Kei from Aris after she gained this body. As she entered Millenium Science School as Aris' younger sister, she also joined both Super Phenomenon Task Force and Game Development Department, which the game registered as a member of former.
Much like Aris, she carries a railgun, which looks like a recolored and slightly altered version of Noa's gun from early unused design.
