Light Yagami, the protagonist of the anime series "Death Note," manipulates his own memories and those of others by using the Death Note, a supernatural notebook that allows him to control the actions of individuals before their deaths. By writing specific instructions in the Death Note, Light can manipulate the memories of both himself and others to protect his true identity as the vigilante known as "Kira." This manipulation of memories is a key strategy that Light uses to outwit his adversaries and maintain his anonymity.