What to Do with the Dead Kaiju is a parody of kaiju movies in general and a couple of the most well known franchises in that genre in particular. The premise is pretty solid: a large reptilian kaiju has just stomped through Tokyo and died at the mouth of a river and the government neither knows why it died nor what to do with the resulting decaying hill of flesh. The government dithers and various ministerial departments seek to score political points while addressing the threat to the environment.

The protagonist is Yukino who is the close aid of the Minister of the Environment and married to Mashiko who is, in turn, similarly the chief flunky of the Prime Minister. Complicating matters is the fact that Yukino is still carrying a torch for Arata who had disappeared in a mysterious white light for a couple years and is now a lieutenant in the Special Forces put together to fight kaiju. The love triangle is neither interesting nor well executed, but it's the only plot linking the scenes together, and so enjoy it to the extent you can.

The humor is fairly low, but not all that effective (but, as always with comedies, YMMV). There are a few slapstick moments that might raise a chuckle. The focus of the film, however, is more on bureaucratic incompetence and malfeasance as issues arise with the decaying mass of flesh. The script telegraphs what kind of ending is coming about halfway through and then sticks with that plan through to a pretty unsatisfying climax. The film is not terrible, but there are better Japanese comedy movies out there.