It's been a while since we've seen Hirohito, and now he's back in his hiding place. He's not sure what's going on, but he can't help wondering if there's some sort of underground facility beneath the building. He wonders if it's something more dangerous than just a cemetery, and he wonders if there are people who've figured out how to build underground tunnels and caverns for military purposes. He asks the gang if they've ever heard of underground caverns and tunnels, and they all agree that they have. They've all heard stories about underground caverns, but they don't know that they're actually dangerous. The gang decides to get into the tunnel, but the tunnel's too tight for them to get in, so they'll have to wait until they get back to their friends. The only thing they can think of to do now is to hang out in the tunnel until their friends come back, and then they can go back out.