An investigation shows that lax requirements for the business management visa have allowed many shell companies to cluster in single buildings, especially in Osaka, with dozens to over a hundred entities registered. Many have capital of at least 5 million yen and share the same Japanese director. Some lawyers help set up these firms and view the site as a pre-entry office or a rental space; banks require accounts in Japan, often via local collaborators. While some say the arrangements are legitimate business that brings economic benefits, others warn of gray-area practices and would withdraw if concerns arise.