Battle Girl: The Living Dead In Tokyo Bay, 1991, directed by Kazuo 'Gaira' Komizu. Low budget direct-to-video sci-fi zombie movie starring pro wrestler Cutie Suzuki. Nightmare logic and slow, hazy vibes. Cosmo Amphetamine. Punk arms dealers in their tricked out bus. A dirigible broadcasts a message.
I watched what I assume is an unauthorized upload on youtube (with ENG subs) on a warm afternoon. Was a good (and sleepy) time. Would love to find a DVD copy some day.
Good Luck Battle Girl.
Edit: Synapse Films released the movie on DVD in North America; it appears there are still copies for sale, so this goes on my list of things to buy.