The online manual for the North American release of Phantasy Star Online 2 confirms that the PC version will be available via Steam in addition to Windows 10.
The “Game” section of the manual reads:
Launch PC game version
When the download is complete, you can proceed to launch the game by doing the following:
- Open the Steam client and search for “Phantasy Star Online 2” under the “Library” section, then click “Play.”
- If you opted to create a desktop shortcut, simply double click on the shortcut to launch the game.
- Windows 10
- Open the start menu and search for the “Phantasy Star Online 2” app shortcut.
- If you opted to create a desktop shortcut, simply double click on the desktop shortcut.
A closed beta for the Xbox One version will run from February 7 to 9. Read more about that here.
The North American release of Phantasy Star Online 2 was first announced for Xbox One and Windows 10 devices at E3 2019. The free-to-play massively multiplayer online RPG is currently available for PlayStation 4, Switch, PS Vita, and PC in Japan. The PlayStation 4, Switch, and PS Vita versions have not been confirmed for a western release.
Update 04/15/20 at 10:25 a.m.: Sega has announced that the PC version will launch in late May and is exclusive to the Microsoft Store. Read more here.