I'm curious what the 'cheap eats' in Japan are for the teenage/young adults living on their own? I'm also interested in any fast and cheap ways to flavor or make dishes with plain rice. I've been eating it a lot lately since I can precook large batches and shovel in rice on the go, but it needs something besides salt. Soy sauce doesn't fit well with plain rice to me, and from what I understand, in Japan you're not traditionally supposed to eat say sauce on white rice, although I could be mistaken.
Anyways, cheap and fast meal ideas, please!