In 2018, humans and wizards live together in Tokyo. Police continue to protect order in society, but wizards (known as Wud) are tried according to magical law via Magic Prohibition Law, in special courts defended by wizard barristers via the Court for Magic. At age seventeen, half-Japanese, half-Canadian Cecil Sudo, has just become the youngest wizard barrister after passing the bar exam at age fifteen, and begins work at the Butterfly Law Offices. While she hasn't realized it yet, she has tremendous magical potential.