Look for a biography of the specific person you are writing about by searching the name as the Subject keyword. If you are not successful in finding a book with this strategy, switch back to the default Keyword (relevance ranked) searching. This is because not all books have subject terms in their catalogue records.
Here are some titles of interest you can find in the Asian Library.
Each of these sets have volumes that cover multiple events in Japanese history. Choose one that suits your time period / broad subject area and see if it contains specific information on your topic.