Visitors to BibleGateway.com can use a single English interface to search 135 Bible versions in 47 languages. Unfortunately, though, no Japanese versions are among them.
BibleGateway does link to downloadable and searchable PDFs of Bible books from the Japanese Living Bible, but this is unwieldy for standard searches. Besides, few churches or scholars regularly use the Japanese Living Bible in worship or in study.
Instead, most Japanese Bible students would begin their searches with one or both of the two most widely used Bible versions in Japan: the New Interconfessional Translation Bible and the New Japanese Bible.