Forgetting to buy souvenir after your fun-filled trip in Japan can be serious problem. But fear not, you can buy HALAL-certified rice crackers made in Japan at Books & Drugs South, located at the international departure terminal of Haneda Airport. Salted brown rice crackers, kanmochi (rice cake made in winter) with beans, and a three unique-flavored rice crackers (black sesame, dried shrimp, and seaweed) are sold for reasonable price of 320 yen (tax not included). Just make sure not to miss your flight due to taking too much time deciding on what to buy!
Books & Drugs South
https://duty-free-japan.jp/haneda/jp/shopinfometion/BooksDrugsSouth.html