Gate of Firmament is a third-person role-playing game made in the Japanese style and in a fantasy setting. The plot of the game revolves around the heirs of two fallen dynasties — Yu Wen Tu and Chen Jing Zou. They are going to restore and return what they rightfully inherited — the Chen and Northern Zhou dynasties. But to get what they want, they first need to find a mystical weapon that has incredible power that will help them close the gates of hell, thereby preventing demons wreaking havoc from entering the mortal world.