No problem, @sparkinson, I have often troubles to read English guidelines. Here it is, in the first part:
Japanese Domestic Releases
The Japanese script doesn't have any inherent capitalization. For releases originating in Japan, characters should be used as-is; with Kanji, Hiragana, or Katakana characters as used in the original titles.
Although the Japanese script has no capitalization, it is very common for Japanese titles to contain words in other scripts. Japanese artists have a tendency to choose capitalization and punctuation for aesthetic reasons; and to be very consistent regarding case over all releases. For this reason, words in the Latin script on a Japanese release should be in the same case as on the album art if other available sources, such as official discography or record label pages, are consistent; not normalized according to English or other capitalization standards.