There are 127m people live in Japan. They use 883 ASNs with around 22m unique IPs.
Get your proxy from litport and you will be able to get many of these residential IPs. It works best for instagram accounts and any other business that require the highest level of privacy and security.
You can choose among multiple cities and mobile carriers. Fast IP rotation.
At this moment we don't have available mobile proxies in Japan. BUT! We might have it available, but for private usage. Please, contact us and find it out.