Tokyo 2020 Olympic Games : Archive images from 1964
Aflo also represents several Japanese historical collections. Please see below for more details.
In terms of Archive material you can see most of our Second World War archive images currently available here or we would be glad to help and to search for you if you let us know. 
We we also host most content in our Japanese Site which you are welcome to browse.
Here are some more examples, with English captions, from the collections we handle:
Mainichi Newspaper
Nikkan Sports
Kingendai
Again each of these partners has more material in Japanese, and even more material offline so we would always recommend to get in touch and tell us what you are looking for.