The Showa period, which lasted from 1926 to 1989, was marked by Japan's militarism and involvement in World War II.

Death Note, created by Tsugumi Ohba and Takeshi Obata in 2003, is a popular manga and anime series that follows a high school student who gains the power to kill anyone whose name he writes in a special notebook.

In the 12th century, the samurai class emerged in Japan, with warriors serving as protectors for the aristocracy.