Cavity, Hole
You see a child with an umbrella in front of you. Suddenly, they fall straight down into a cavity in the road. It's a big hole!
You run over to where the child fell. They are just fine! Because they had an umbrella, they were able to float to the bottom.
こう
あな
None
"Into my cavity you go!" yells a voice. It is こういち.
"You will stay in that cavity or hole until you repent." If it hasn't been clear up until now, Emperor こういち is going mad with power.