My suggestion would be The Japanese Kitchen by Kimiko Barber.
Japanese ingredients, themselves, can cause a lot of confusion and this book is great since it explains every ingredient. Each page is dedicated to something new, with 1-3 recipes. Ie. sake, sesame, salmon, etc.
I like most of Kimiko Barber's books, actually.
I also like Washoku by Andoh. Her tastes are more subtle but the dishes are gorgeous.
I borrowed books by Harumi Kurihara from the library but was not tempted enough to buy them myself.
I also have Japanese Cooking by Tsuji but the lack of photos don't have me gravitating to it as much.
The Japanese Kitchen by Simbo is also another popular cookbook. Akin to Tsuji, there a complete lack of photography.
Hope this helps!