It is unlikely that you will be able to get the one year multiple entry visa in Japan because one of the things you will need is a letter from the company stating your need for such a document and they will not provide you with the sponsorship to obtain such a visa, Why? Because you don't really need it. During training they will provide you with a students visa, but after you get checked on the line, you will commute in and out with a shore pass that transfers you from CREW to PAX and vice e versa, in the case that you want to stay and spend your days off in Japan, or you have a couple of days off and you want to go for a road trip outside of the metropolitan area (the shore pass is limited to the city of Narita, Tokyo, Yokohama) then you can come in with a 90 day visa given to you on the spot (provided your citizenship is part of the visa waiver program with Japan) you can get this visa coming in as passenger or crew.