I have never been to the parts of Asia you mention, but if you don't stay right in Tokyo, Japan is doable on $5000 for 3 months. I had an (extremely small) apar

I have never been to the parts of Asia you mention, but if you don't stay right in Tokyo, Japan is doable on $5000 for 3 months. I had an (extremely small) apartment outside of Machida for $300/m. I would guess that outside of Tokyo, Japan might be cheaper than Singapore. The towns near the beach are chill, inexpensive and have many amenities compared to american small towns. I spent less than $8000 over 9 months and went on many trips, bought random electronics and clothes, etc. The most expensive part of my stay was train fare.