firehills went to Embassy of Vietnam
On April 10, 2006 I went to Embassy of Vietnam in Japan to get the visa. It is in a quiet resident area of Shibuya, 10 minutes walk from Yoyogi-hachiman station of Odakyu Line. Their website said that it was necessary to bring a guarantee letter from the sponsor in Vietnam to get business visa. But when I made a phone call to them, they told me that letter wasn't necessary, passport and photo were enough and visa would be issued immediately. There were 3 consulate stuff there and they issued my visa in just 20 minutes without any letter as they told me. I got a 3-months, multiple visa. Issuing fee was JPY10,000.