Meet Isabelle, a quiet and secluded cellist. Now meet Mona Lisa, a loud, obnoxious street fighter. Although these two are polar opposites, would it be hard to believe that they are the same person? According to Adam, it is. Adam is the Black Knight, better known as the mysterious and dangerous kid with zero friends. What'll happen when he figures out Isabelle's secrets? Will it drive the two apart or bring them closer together? Or will a certain twin get in the way?
3 parts