After logging in as much as you want in the Dimension Player app, a window will appear stating "This player is not registered when you log in. Do you want to register this player?"
Press "Yes" to watch unlimited viewing. If you do not register as a player, you will not be able to view the video properly.

Regarding purchased videos, Dimension Player displays only streaming compatible videos.
Works that do not support streaming will be hidden.
Download it to the Oculus GO “movies” folder and enjoy it locally.

(Dimension players in areas other than Japan may not appear even if they are searched at the ocular store. Please purchase after checking whether you can play the player when you buy the monthly unlimited streaming items.)