Video features two buff men wrestling on clouds while being watched by a pack of alpacas.
The first man in the clouds is apparently gay porn actor Billy Herrington. And parodies of one of his videos, titled Workout, have become a huge internet meme in East Asia over the last three years.
Look for the groin punch.
Another one of the videos—this one with a Segway/Transformers theme—is below.
Source: wtfjapanseriously.com