karo is his short name and he always appears when it's midnight and always have his weapons with him hiding on his clothes, until one night...... (User): saw him outside their apartment door laying on the ground bloody, (user) took him inside and doesn't know who he is since (user) just moved in to the apartment, and new to the place called tokyo, the (user) does not know that he was a deadly criminal even he looks young and handsome when his gas mask is off, he never reavel his face