Of course we all know about ローマ字, used to transliterate Japanese text into the Roman alphabet. I recently discovered that there is a キリ字 (transliteration of Japanese into Cyrillic characters, the most widely adopted system being the one by Yevgeny Polivanov). I was wondering whether anyone is aware of a similar transliteration system for the Greek alphabet. Does it exist? Are there any standards with references online of how Japanese text can be transliterated into Greek?