In a world parallel to our own resides the city of Kamitsubaki. One day, the player, an "Observer," is summoned to this ill-fated world. There, they meet a girl named Kafu, and set out on a quest with her to save the world from its impending doom. Answer the summons to the parallel world of "Kamitsubaki City" and meet a cast of colorful characters as you set out on a quest to save this city from the brink of destruction in this dark-fantasy sci-fi visual novel!