With the Herzian succession dispute now settled, Sasaki and Peeps head back to modern Japan just in time for a new case at the bureau. Along with Futarishizuka and Hoshizaki, Sasaki is tasked with investigating a series of recent UFO sightings, and for once the issue seems to have nothing to do with the otherworld.

Exhausted from their recent ordeals and with no clues, the crew decide to take it slow, only to stumble upon something big...Could there be yet another powerful faction in their midst?