"The Planet of Squirming Insects" is another name for the arid planet Lilythea. In its wastelands dominated by the ecosystem called "insects" Primabella, a "bee," saves Lamritta, an "ant," who is attacked by worms. Lamritta calls her savior "onee-sama," and the girls gradually become closer. But the history of an endless war between "the bees" and "the ants" drives a great wedge between them.
