If you weren't fortunate enough to see the behind-closed-doors demo of Metal Gear Solid V: The Phantom Pain at E3, series creator Hideo Kojima has you covered, as a 30-minute gameplay demonstration of that very same footage will be streamed tomorrow.
Kojima made the announcement on Twitter, saying, "Tomorrow at Kojima Station (7pm JPT), we will show you the actual MGSVTPP gameplay demo(PS4). Pls note the presentation will be in English."
To be sure you don't miss it, I recommend you bookmark this page and set a reminder on your calendar. When the stream goes live tomorrow, you'll be able to watch it right here.
You're welcome.