The best breakfast for me to have and the one that I always look forward to having, while on vacation in Japan is this:
Truthfully, anything with natto (fermented soybeans) is good for me. ^^
It's smelly, the taste is strong, it's slimy and it's absolutely TASTY!
This whole lot (as seen in the picture) was a mere 530 yen.
Minus the salmon, the set cost only 330 yen.
And of course, I miss the nama tamago (raw egg) too. Yummy eaten with a bowl of hot rice, just like natto is.