We got our 3-year multiple Japanese visa entry last week. Here are some tips for you:
1 take visa photo at Costco store
2 fill out the application form/travel plan
3 book hotels and flights from expedia.com; print out itinerary; cancel the booking if necessary
4 copy all the documents
5 download recent 6-month bank statement
6 write a letter why you want to apply for multiple Japanese visa entry
7 drop off all the documents at embassy Japan
Wait for 3 business days and your visa can be picked up if they approve. If they require further document, all you need to do is email them.
If you have any question, leave a comment below.