Episode Title:
Proceed! The Boys Expedition Team!.
Episode Description:
Raiga and Kuga are given a new mission. They're to go to a limestone cave beneath Shuyoshidai, a part of Guchiyama City. The reason is due to a photo which was sent to Earth by someone who discovered underground dwellers there. Although intrigued by the idea, the twins are skeptical, because the unclear photo appears to depict Dark Spinner...
