On the plot, Nagai Maria is a gravure Idol dating a pop singer who together goes to a hot spring for a retreat. There, they meet this couple of Americans who recognize her and ask for an autograph. Later on, this same couple of dudes will convince her to have a 3P.
And the eternal beta boyfriend? He gets a glimpse of what her girlfriend is doing at minute 2:28:00. At least this time he attempts to stand up, but still, so much cucked.
Regardless, the real star of this video is Maria, she did a superb job and now I am a fan.