Regarding the 2nd chapter of Higurashi anime version

Rika-chan, Satoko, there's something that's been bothering me...

How old are you two?

How rude of you asking the age to a lady

Well, you're right but...

Hey, elementary schoolers

Let's go back, Satoko

"Every person registered during the creation of this work is at least 18 years old", isn't it?

Higurashi is often mistaken with an erogame, isn't it?

Y-Yes...

What is it, Keiichi?