The top two characters are Japanese for Buddha I think, and the bottom two characters are Saigyo, the name of a famous medieval Japanese Buddhist poet. Don't know what (if anything) the four kanji might mean when all together, or their significance on this cover.
The 4th kanji is "yuki", which can be translated as "via", so the first 3 are some destination. The simple meaning of the 3rd kanji is "west" and the simple meaning of the 2nd kanji is "orchid", and I don't recognize the first kanji. But many foreign destination names are based on ateji, so the meanings may have little to do with the destination...
dandow, thanks for the link, too. The more references the better, I think.
I actually ended up there by finding the characters in a Chinese character site by stroke count. Not the problem here, but many things I've looked for involved traditional characters in either language so that's been a problem.