Gren-chan embodies the Grendizer robot within the Robot Girls NEO narrative. She lives with Z-chan and Gre-chan in Nerima's Shutter District, a zone devastated by an unexplained Photonic Energy disaster. Their residence, Photon House, is built from salvaged materials of the photon research facility tower that now stands as a monument. Though Getter Rays descending from space dominate the environment, the trio persists in using residual Photonic Energy to power their household.