|Spoiler Alert: This page contains spoilers. Read at your own risk.|
Japan (日本 Nippon) is a nation made up of an archipelago.
Japan's territory is a bit larger than before, as they took a few islands during World War III. 
- They have few Magicians but are very advanced in Magic Technologies as a result of past experiments.
- The Ten Master Clans are the leaders of the Magician Community and Magicians are considered a national asset and as such can't travel outside of Japan. It's the price to pay to have many privileges.
- Japan still does not have the right to call their military an army but the JSDF (Japanese Self Defense Force) appears in the story.
- Their lineages of powerful Magicians are considered the most refined in the world.
- The Juumonji Clan are considered to be the best defensive Magicians in the world.
- They possess the strongest Magician of the current age, Yotsuba Maya.
- They possess the Yotsuba clan, who are feared around the world as the possible harbingers of World War IV.
- They have one of the Thirteen Apostles, the Strategic-Class Magician Itsuwa Mio and another unregistered Strategic-Class Magician, Special Lieutenant Ooguro Ryuuya.
- They possess the unrivaled Magical Engineer Taurus Silver.