Second Sino Japanese War Art reflecting China Japan Friendship Propaganda

This week I have listed several paper materials on ebay relating to Japan China friendship & the East Asia Unity propaganda at the Second Sino-Japanese War time.
Especially children books on that matter are interesting.

1930's Japanese Postcards "China rises" Japan-China Friendship & Anti Westerners Propaganda Art

1940 Japanese Children Picture Book on Friendship with China " The New China "

1940 Japanese Children Picture Book on Friendship with China "Neighbor Friend"