Hyperdimension Saturnia

4 nations were build on this land called, Gamindustri. Each nation was under protection of a goddess, also known as a CPU (Console Patron Unit)
Planeptune was protected by the CPU, Purple Heart.
Lastation was protected by the CPU, Black Heart.
Lowee was protected by the CPU, White Heart.
And Leanbox was protected by the CPU, Green Heart.

In a forest that was further away from Planeptune's capital, was a lone girl, lying down onto the ground. The girl's name was Saturn, she wake up with none of her memories in tact (Because that has never been done all ready).
Immediately after she woke up, she got contacted by a voice in her head.
The voice introduced itself as, Mercury, a holy spirit from another dimension.
Mercury was sealed about a thousand years ago, but someone took the pieces of the seal out of their temples, causing them to scatter around this universe.
But that was not all, a comet known for destroying dimensions upon landing on the surface of a planet was heading straight for Gamindustri.

Mercury could absorb its power and stop it, but he needs to be freed from his seal first.
Since Saturn had nothing better to do, she figured she might as well embark on this quest to get all of the Seal Pieces.
But it appears she's not the only one looking for them, an evil organization, named 13th Universe, was also collecting the Seal Pieces for an unknown goal.
Can Saturn defeat the organization and collect the Seal Pieces before the comet arrives?