"Aren't the shapes of Koichi's nose holes a bit weird?" "Really? I think they are cute."
When Koichi has a nose bleed, he sticks a tube-shaped fish paste cake in there to stop it.
"Your nostril..." "What? I can’t hear you." "Well never mind. It’s nothing." "Now you have to tell me. What were you saying?"
What's your nose's hole? How about your nostril?
The reading is the readings for 鼻 and 穴. Smell that fresh air through your nose hole.