Sentai Taboo

In the near future, humanity is in the depths of fear due to the monsters' onslaught. Day by day, the united Cross Rangers squadron is enforcing justice to protect world peace!... or so they're supposed to. Cross Red (a.k.a Reo Akama) is a man who burns with righteousness. His overflowing sense of justice leads him one night to commit a taboo with Cross Pink. And so begin their days of downfall...! A suspenseful story of the immorality of justice!

(Source: Kodansha, translated)