geistault's Maribelle was just casually moving some boxes of equipament around her workshop and tidying up the place when she spotted a mysterious closed box with a strange question mark stamped on front. The mechanic didn't remember ordering that one, so she quickly grabbed a crowbar to open it and see what was inside.
But for her surprise, as soon as she opened the block-like box, a great suction force came from inside it, catching Maribelle by surprise and quickly pulling the girl inside!
It was long until the box opened again, releasing something small and squishy jump out of it... it was Maribelle! It seems that the strange block box transformed her into a small power-up of her former self, a Marishroom!

Fortunately she can still slide around the ground to find help, hopefully avoiding any hungry plumbers that could be in the way...