Light Yagami manipulates the media in the anime "Death Note" by using the power of the Death Note, a supernatural notebook that causes the death of anyone whose name is written in it. By eliminating perceived threats to society, such as criminals and those who oppose his views, Light creates a sense of fear and uncertainty among the public. He then presents himself as a savior who is bringing justice to the world, thus gaining the support and admiration of many people. Additionally, Light strategically uses the media to disseminate information that supports his narrative and discredits his enemies, further shaping public opinion in his favor.