So I managed to get hold of a copy of Power Smash Tennis (The Japanese version of Virtua Tennis) and took it online. I thought there was just an online site and leaderboards, but it looks like there's a fully fledged online versus mode too! As can be expected of a Japanese release at this point in time, the versus mode is offline (The connecting process works, but there's no server to connect to), and while the Homepage option works, the site is awaiting transfer (Though it does properly re-route you to Dreampipe!). Dreampi Companion also doesn't recognise you're online in the game yet either, so the option doesn't light up in your Library.
Here's the Network Option in the Main Menu, as well as how to select each online mode.
Terms of Service screen and the Translation
Phone Call Charges screen and Translation
Dialling Up/Connection Screens (Translated)
Connection Failure (Translated)