The class investigates ghost sightings at an amusement park. Rin is partnered with Shiemi, and they find the ghost of a child. He runs away, turning things into a game of tag! Separated from Shiemi, Rin is confronted by Amaimon, King of Earth.

The first semester has ended, signaling the start of summer vacation for True Cross Academy students. But there's no rest in sight for Rin and the other ExWires: first they must take part in a 3-day drill to prepare them for actual combat, under the guise of a camping trip out in the forest.