The latest issue of Shogakukan's Monthly Hero's Magazine recently announced that the upcoming TV anime adaptation of Sword Gai manga will also simultaneously premiere on Netflix worldwide in spring 2018. The issue also revealed that Toshiki Inoue will be writing the scripts for the anime and is in charge of series composition.
The anime was first announced by Monthly Hero's Magazine in the year 2014. The anime was supposed to be a collaboration project of Flash anime studio DLE Inc. and entertainment content company Fields.
Monthly Hero's Magazine originally announced the anime in 2014. At the time, the announcement noted that the anime will be a collaboration between Flash anime studio DLE Inc. (Eagle Talon, Thermae Romae) and entertainment content company Fields.
Sword Gai (Sōdo Gai) is a Japanese manga series written by Toshiki Inoue with original character design by Keita Amemiya and art by Wosamu Kine. It began serialization in Shogakukan's seinen manga magazine Hero's in 2012 and has been collected into six tankōbon volumes. A sequel series known as Sword Gai Evolve (Sōdo Gai Evolve) was released in 2016 and is currently ongoing.
The story revolves around Gai, who was born beside a woman who met her death in a forest. He was adopted by the sword-smith Amon. A few years later, Gai becomes Amon's apprentice, and during the forging of a sword, he loses his right arm. To help him, Amon crushes the demon sword Shiryū (lit. Death Dragon) to form it into Gai's replacement right arm. Gai then is able to fuse with the weapon on his arm, and fights against his enemies.