Kendo, a martial art that uses bamboo swords and protective armor, is a popular sport in Japan and is often taught in schools.

Attack on Titan, created by Hajime Isayama in 2009, is a popular anime and manga series that takes place in a world where humanity lives in fear of giant humanoid creatures known as Titans.

Japan invaded Manchuria in 1931, which marked the beginning of its aggressive expansion in Asia prior to World War II.