Japan is currently being hit by terror regarding the figure of Kira, an unknown person who killed thousands or even hundreds of people simultaneously. Light Yagami is the Kira in question, he killed thousands of people using the "Death Note" book given by Shinigami

Light is now in his class, sitting listening to his friends discussing Kira, Light just grins in amusement, then mutters to himself

"Pftt it's so pathetic, I should have finished off the people in this class too."