The Azure Sword, Slayer of Distortions

The world is filled with supernatural objects that house distortions of the world called “Vanits.” Shin Karamori wields one such artifact—an azure sword that granted his wish to live and gave him incredible combat abilities yet curses all those around him. Karamori throws himself body and soul into fighting bloody battles involving Vanits, accompanied by an artificial young girl named Archive, whose fate is dictated by a certain book. Karamori fights to save an important figure from his past, and he'll do anything to make it happen, even if that means Archive losing her life. When the tragic pair meets a high school girl, the wheels of fate rapidly start to spin. But is the future awaiting them one of annihilation...or something else?

(Source: Yen Press)

Note: Winner of the Gold Prize in the 30th Dengeki Novel Taisho.