The player controls a beautiful girl named Rei Hatada, who in order to “revive” her dead younger sister Mirai Hatada, makes a deal with the devil of the other world that is limbo. The story will progress as you fight the souls that drift about limbo. Also, by defeating specific enemies, “Danmatsuma Thoughts” will appear, which by “crying to purify” will develop the protagonist mentally. In accordance with that, you can obtain weapons called “Shisou,” or “Mental Armor.”