The Adventure Club is back in action. Isshin proposes that they plan an overnight trip to a hot springs town on the west side of the island, where he suspects they'll find the next ruins.

At the start of class one day, a first year student comes to see Tensai. After speaking with her, Tensai returns in a bad mood and walks out of the class. The same day, one of the people Juugo met in the Tsukuyomi District, Tetsu, transfers into Third High School.

Hoping to clear the ruins in Southred Mall before Ikusaba, the Adventure Club follows Nanana's hints to find the entrance to the ruins. But the entrance is too visible to passers-by, so they agree to come back that night to conquer it. Back at the Happy House, Nanana asks Juugo several questions, but Juugo is too anxious about Ikusaba to talk.