The series centers around a Yagami Layto who discovers a notebook that allows him to kill anyone by writing the victim's name on it. 
 I liked the concept so much, very original, the manga was adapted to a serie and gained a huge popularity, however Death Note "[turned] Japan's most-popular print medium into an internationally controversial topic that has parents wondering whether they should prohibit their kids from reading manga entirely." 
 It might be offensive to some people specially religious people, because of that Death Note was banned in many countries