God Eater Burst

[Garteal]

It's a problem with the emulation. I've had that too, and I've passed it using an older version of the emulator.
Download it and copy over your save. After the ending you'll get a chance to save, do so and go back to the newer version.
Note that you'll have to beat the boss again.

Next time read (and post in) the game thread as it has been answered several times already.