Sword Gai
Japanese title: 『ソードガイ 装刀凱』3DCGプロモーションムービー
Alternative titles: Sword Gai 3DCG Promotional Movie
Type: ONA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Oct 4, 2013
Duration: 1 min
Rating: R - 17+ (violence & profanity)
Studios: Digital Frontier
Genres: Action, Supernatural
Demographics: Seinen

A promotional video for the manga.

The story revolves around Gai, who was born beside a woman who met her death in a forest. He was adopted by the swordsmith 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 his replacement right arm. He then is able to fuse with the weapon on his arm, and fights against his enemies.

(Source: ANN)