The karaoke machine, which was invented by Daisuke Inoue in 1971, has become a popular form of entertainment worldwide.

Nagoya is Japan's fourth-largest city and a major industrial center, with a population of over 9 million people in the greater Nagoya area.

Sword Art Online, created by Reki Kawahara in 2009, is a popular anime and light novel series that takes place in a virtual reality MMORPG world.