You're messing with me, right?
"I'm serious! I only want to be with you, mister!"
I'm way too old for you, little girl.
"But I'm made for you! I'm for ojisan-only JK!"

Ojisan-only JK...?

On the way home from work a schoolgirl named Mari-chan suddenly asked him out.
She must want money or something. It was a scam or something!
But no, in the course of time, he would learn that some girls are just meant to be...

What is an "ojisan-only JK"?

A kind of angelic teenage girl who lives to fulfill the dreams of an older man.

[From DLsite English]