The manga series Death Note features an extensive cast of fictional characters designed by Takeshi Obata with their storylines created by Tsugumi Ohba. The story follows the character named Light Yagami, who chances upon a supernatural notebook which grants him the ability to cause the death of anyone he writes in it. Light uses the notebook he finds in order to cleanse the world of humans he has deemed unfit for society. A team of professional investigators set out to find out the mysterious killer and arrest him, and thus many other characters are introduced until Light is eventually caught.