ゼロの使い魔
The light novels are one of the top selling series in Japan, with 6.8 million copies in print by February 2017. "The Familiar of Zero", and fan fiction based on it, helped pioneer the modern "isekai" ("other world") genre. It popularized the isekai genre in web novel and light novel media, along with the website Shōsetsuka ni Narō ("Let's Become Novelists"), known as Narō for short. "The Familiar of Zero" fan fiction became popular on Narō during the late 2000s, eventually spawning a genre of isekai novels on the site, which became known as Narō novels. "The Familiar of Zero" fan fiction writers eventually began writing original isekai novels, such as Tappei Nagatsuki who went on to create "" in 2012.