Comforting and filling, the hearty katsudon has been the classic "winning" food in Japan for decades. The reason why it's considered lucky is straightforward - "katsu (カツ)" as in "cutlet" is pronounced the same way as "katsu (勝つ)" as in "win".
The humble Japanese rice ball is said to be especially auspicious, originating from farmers who sought the favor of the mountain gods. The farmers would form the rice in the shape of a mountain and would bring them on their journeys to the mountains to share with the deities.
Comparatively new and hip on our lucky food list is pasta. The shape is fortuitously long like soba, but most importantly, pasta sounds like pass-da!, as in "I passed the exam"!
4. Slimy textured food
Perhaps slightly harder to stomach for foreigners, this food group includes the infamous natto (fermented soybeans), tororo (grated mountain yam), and okra. Supposedly filled with health benefits, they're considered lucky because the onomatopoetic Japanese word for slimy is "neba-neba", which sounds a lot like "never, never (give up)".
5. Kit Kats
Pronounced "kitto katto" or "kitto katsu", it means "sure to win" in Japanese. A lot of people swear on the lucky powers of Japan's many-flavored Kit Kats, but look out for the special "exam season" version, which would usually be on sale in January and February with messages on them in Japanese to cheer you on.
Honorable Mention: Koala no March
The Japanese word for falling can also mean failing, and since koalas don't fall off their trees even when they sleep, these adorable cookie puffs featuring koalas with delicious chocolate filling should give you a steadfast grip on your dreams!