Can I call this film dreamy? I don't know if it's wrong to call this film dreamy. Maybe I watched it late at night, at a time when I should've been dreaming. But I don't know... the atmosphere struck me as strange, the use of colour was unpredictable, the whole movie seemed to glide right past me, and there was something unsettling about how it felt.
The story is also a little intense. Maybe more so nightmarish or fever dreamish than normal dreamy. It's about a family who fake motor accidents - as pedestrians - to extort money from drivers. They have their kids involved, and then that leads to extra drama. Things don't play out as expected. Some things never happen, and some happen very quickly. Its arthouse in the "unpredictable structure" sense, but not in the "we're going to be boring and/or pretentious sense," because this film moved well overall.
Nagisa Oshima was a strange but always interesting director. I don't know if I've disliked anything he's done, and films like Death by Hanging and Merry Christmas Mr. Lawrence both his me pretty hard. Boy's another solid entry into his filmography, so it seems.