The year is 2145, virtual reality had taken the next step in evolution six decades ago and developed a Full Dive system that allowed humanity to sync their consciousnesses with brand new virtual worlds. The most innovative and interactive game known as Sekai no Kyū (Sphere of the World), is a Japanese masterpiece localized across the entire World. Jack Graham plays as a Seraphim, one of the highest ranking and rarest Angel race classes in the game. He's also one of the few foreign English speakers who plays on the Native Japanese Server. Jack, known as Sephir in-game, is a leading member of the PKKer guild Solvent 52, and has renown as one of the top LvL 100 players of the game. He is paid by the developers to help beginner player characters and instigate the completion of challenging quests. Hospitalized and emotionally stunted in real life, after a traumatic event that claimed his little sister's life and nearly his own, Jack uses virtual reality as an escape from the Greater World. Now... He finds himself in a New World with three weaker people he hardly knows at his side. Will he keep them, or dispose of them? Probably he knows...