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.
The Meiji Restoration in the late 19th century saw the overthrow of the Tokugawa shogunate and the modernization of Japan.
Tokyo is Japan's largest city and the world's most populous metropolitan area, with over 37 million people.
