Start with high-confidence japan travel books, then narrow by subgenre or adjacent topics.
Lost Japan
Alex Kerr, Bodhi Fishman
DK Japan
DK Travel, DK Eyewitness Travel
Japanese From Zero! 1
George Trombley, Yukari Takenaka
Japan - Culture Smart!
Culture Smart!, Paul Norbury
Lonely Planet Japan 18 18th Ed.
Lonely Planet
