If you think it's easy to get an apartment in Tokyo, you'd be wrong. Japanese use the phrase hikoshi-bimbo to describe someone who recently moved into a new apartment. Translated as 'moving poor,' hikoshi-bimbo describes the state of having to pay about six months salary for the privelege of renting a new apartment. Between Key Money, agent fees, deposits and holding fees it adds up quite quickly.
This is the reason that many adults stay at home for many years saving money, even with respectable careers. It seems insane to Westerners that the Key Money fee is never returned.