Here is an announcement. This can earn you money faster than part-time job. Just write an essy about Malaysia Independence Day and you will get 15,000 yen if you capture the 1st prize. Of course other prizes will also be prepared.
Lets say you spend 3 hours to write an essay and that is equal to 5000yen per hour work. Where can you get a better bargain ?? Maybe even kabukicho cant give you that.:p
Here are the official posters.
Good luck. The best part is no boss will scold you and you got nothing to lose on giving it a try.