Needless is set in the future, after Because of the events of WWIII, specifically the bombings, a black hole has appeared in what was once . The inhabitants of this area have gained called "Fragments". The city's people on the outside have a label for those that have these strange powers: "Needless".
The Manga is divided into two separate parts. Part I introduced the characters, starting with the meeting between Cruz Schild and Adam Blade. The arc's events resulted in the two opposing sides battling at Simeon tower. The battle ended when Adam Arclight, mad with rage, released the full power of PF Zero. This caused a huge explosion which damaged the Simeon building, and scattered everyone. Cruz woke up alone in the Ruins of the Simeon building after a vision of Adam Blade gave him some encouragement.
Part II is ongoing as it is centered on Cruz as he journeys to find his scattered friends. In a surprising event he is found by Mio who decides to join him in order to see Blade again. They have had various success and made new allies but Arclight is aware that Cruz is alive and has ordered his death. As of the current chapter, Cruz was found by the bulk of his friends.