That was a bit freaky, as you'd expect from Sion Sono. It's a short film, obviously, so it ends when you're not expecting it and leaves questions unanswered. But I'd recommend it to anyone who'd like to have their head turned inside-out (a little) for ten minutes.
Two couples go to visit Dad for Father's Day. They find some mute bloke in a wrestler's mask who "says" inconsistent things by writing in a notebook and makes sinister demands. Anyone who agrees will be taken into another room, after which we don't know what we're hearing but it doesn't sound normal. Husbands assume the worst.
The film's saying alarming things about whether children would even recognise their parents. Men celebrate something that would only be worthy of celebration if you weren't normal. Women accede to alarming things. Fathers have worrying priorities.