I'm not sure I get why it's funny, but I get that it's funny.

Everyday is national something day. You can tell it doesn't really matter because no one has any idea what special day it is until someone else posts it. Some might even say they're made up. If that's true, why are they so dull?

Japan is fixing that, I guess. Today (07/21) is national masturbation day, well in Japan at least. Maybe. At least one company is claiming that, and perhaps only because they have a new film coming out. This 'film' features a new hero, a masturbation hero.

Apparently the date in Japanese is really easy to make a pun with, that pretty much translates to jerk off day. No, none of this makes any sense, and neither will the video, but you should watch it anyways.