
He was 9? From what I remember the boy is at least 11 and Chika is no older than 18... I think people believe the age gap in this story is a lot bigger than it really is lol..
Ch.5 states Haruka was in middle school and I know Chika was in HS
So unless some of the info is wrong the age gap is no more than 7 years

Idk I think he was like 9 10 at the most cause was a third year and the boy looked like he was still in elementary school cause by middle school from some other mangas i read in middle school they usually learn what their secondary gender is. He didn't know what one was so i think the age gap was bigger than 7
I was very very cautious when i started reading this, cos of the 'shotacon' tag. I was ready to zoom out if there was smut with a smol child but IT WAS SERIOUSLY SO CUTE AND I LOVE IT. IT WAS PURE