HYPNOSISMIC -Division Rap Battle- Rhyme Anima

After a third World War that killed a third of the human population, history as we know it came to an end at the hands of women. In this new age, rather than fighting using traditional weapons, people use a special microphone that attacks the human spirit called a "Hypnosis Mic." Lyrics uttered on this microphone act on the human nervous system and can produce altered states. Rap battles are now the main way to establish dominance as gangs of men fight in the districts of Tokyo to defend their territory.

Synopsis from Anime News Network