(taken from imdb.com)
"Minami, a member of the Azamawari crew, highly respects his Aniki (brother) Ozaki who has saved his life in the past. However, lately Ozaki's eccentricities (like claiming that a Chihuahua hs sees is a 'Yakuza attack dog') have been making everyone wonder about his sanity. Chairman Azamawari is unsympathetic to Ozaki's little outbursts and secretly orders Minami to take Ozaki to a disposal facility in the city of Nagoya. There, the fate of these two follows a twisted path filled with violence, mother's milk, strange locals, and ultimately the disappearance of Ozaki's corpse which Minami now desperately tries to recover."
That covers about 10% of the film's story. You really have to see it to see just how funny it is