1001 Knights, commonly known by its debut name, 1001, is a 2012 shoujo manga series by Yukiru Sugisaki who has also gained her fame through DNAngel and Lagoon Engine.
The story follows two twin brothers, Naito Fuuga and Yuta Fuuga, into a parallel universe similar to the world of One Thousand and One Nights. Journey, start~!
Please bear in mind that the wiki may contain spoilers.