

Shin Megami Tensei: 20XX Devil's Colosseum is a mobile game developed as a precursor to Shin Megami Tensei: 20XX.
A brother and sister are abandoned by their parents at an orphanage named "Silent Night." As they grow up together, the girl is taken over by a demon at the age of 14, transforming the orphanage into a dark, labyrinthine nightmare filled with terrifying creatures. After obtaining a COMP from a mysterious man in a wheelchair, the boy embarks on a journey to rescue his sister and restore peace to the orphanage.