Once upon a time, there was a strange 2-D universe with a lot of weird planets. On one round planet their lived a lot of round circles; everything there was made of round shapes. Ci lived there too, and when he wasn't busy with his favorite hobby – that is, rolling around – he liked to ponder how he could impress Pi. Pi was a pretty circle.

But one day it happened that as Ci was happily rolling around, the bad squares showed up. They came from a faraway planet where everything consisted of squares. The squares, better known as "bad boxes," hated everything that was not made up of squares. Their king, "big bad box," had all the circles abducted, and one of them was Pi.

Now all the circles were gone. Ci was left behind all alone on his planet. King bad big box ordered the planet of the circles to change into squares after a while. Ci decided to defend himself and to look for Pi. At night, Ci would sleep, and during the day, he would search throughout the kingdom of the bad boxes for Pi.