In an attempt to colonize Mars, 21st century scientists seed the planet with algae to absorb sun light and purify the atmosphere, and cockroaches who in turn spread the algae as they feed. 500 years later, the first manned mission...

As sadomasochistic yakuza enforcer Kakihara searches for his missing boss he comes across Ichi, a repressed and psychotic killer who may be able to inflict levels of pain that Kakihara has only dreamed of achieving.