Haruto

A 3rd-year high school boy and Nene's boyfriend. He is incredibly sweet to his girlfriend. He jokes around a lot, but if something happens, he stays bright and helps out with a smile.

Nene

A 3rd-year high school girl and Haruto's girlfriend. She's cute, a bit of a klutz at times, and is usually seen smiling.

Guide

A professional cave explorer. He leads the way and teaches everyone how to navigate the terrain. He's funny, jokes around occasionally, and laughs a lot.

Observers

Yusuke Inoue, Kasu, Karen Otomo, and Daisuke Nakagawa. They watch over the group through the screen, providing commentary, jokes, and reactions.