In a world where certain people, titled "Knockers," have awakened to innate supernatural abilities, Agent Xian Yu is a member of a special ESPer crime-fighting unit and puts righteousness above all else. Kirscher Schneider doesn't care much about justice, but he does set about enforcing it in his own unique way. When these two men with polar opposite personalities meet, sparks fly, but the emergence of a Knocker-run mafia group named Monarch means that they're grudgingly forced to team up in order to defeat a common enemy. Special agent Xian Yu, who lives only for justice, meets the worst partner in a most unexpected way. Other team members are very happy with each other, but why are we the only one like this? A special agent and a criminal who are forced to be a team - can they become lovers?