Crystar

The player controls a beautiful girl named Rei Hatada who, in order to "resurrect" her dead younger sister Mirai Hatada, makes a deal with the devil of the other world, Limbo. The story advances as you fight the souls that float around in Limbo. When you defeat certain enemies, "danmatsuma thoughts" appear, which spiritually evolve the protagonist by "crying for purification". Accordingly, you can get weapons called "Shisou" or "Mental Armor".