This is a  book titled our air force.
published in 1937. 
It's from that time.

Number of pages: 312P size: A5 size

Propaganda for young people during World War II. 
This is a non-fiction book for children with many 
typographic photographs of the Imperial Army's
 flying regiment, air force, army aviation weapons, 
and national defense weapons. Even if you can't 
read Japanese, you can enjoy 
it because there are many pictures.