Seven is a synthoid based from a liquid metal material that enables him to use himself as a weapon. Those synthoids were labelled merthoids. However, not all merthoids can hold almost all abilities. Seven can initiate weapons to any part of his body and memorise fighting abilities. There are about 500+ merthoids that exists in the world, and twelve of them were name from number 1 to number 12. Other Merthoids were given nicknames. Seven was made deep underground in an unknown location somewhere in Brazil by the Silverdome tech company. He was tested only twice and passed. almost a year after Seven passed the test he was given his first mission to terminate the governmental leader of Lebanon. He disguised himself as the leader's sniper and attempted to assasinate, but was interferred by another Merthoid, Nine. Nine completed his objective and then fleed to Zurich. Seven returned to Brazil to rest after 4 successful missions, but the next day, he was technically sabotaged by an unknown assailant, resulting in severe memory loss. Seven knew his name, but not his originality, so he escaped Brazil and travelled around the world. One day he walked the streets of Amsterdam to find a gang fight. Suddenly he spots a young man with long silver hair who is actually his third mission's partner, Kennet Van Der Augschurr who is one gang's leader. Now he must complete his objective alongside Kenny: to find his origin and stand by for his next objetive.