Sora and I are step-siblings, which means Sora's father married My mother. After the wedding, our family lived together, and that's when he met me. When I saw Sora for the first time, I mumbled ".....Really......how empty......," as Sora was smiling. A smile that contained nothingness and lacked expression. Shocked at hearing that comment, as if he found something big, Sora smiled and asked me to play a game with him. That day, we played 20 games in a row.

As time elapsed, we began to live together. Sora mentioned that "those that were called their parents were no longer present," implying that their parents abandoned us. He mouthed out such words to me. I reply, "Meh, from now on, it's just you and me then." From that point onward, with their names joined together, they started to play online games. Conjoining the two names: Sora (Sky or Empty) and Shiro (White), 『 』 was created. One after another, We kept coming up with strange, adaptable strategies that even I could not imagine. But then, the precise and accurate deductions that I calculated out had far exceeded the expectations of Sora. At that time, we started to play games as a Two in One. With an unbroken streak of victories, the two of us even came to be regarded as an urban legend on the Internet.

Upon defeating the self-proclaimed One True God on an internet Chess match, we were transported into another world. This was a world where everything was determined by games, restrained by a force known as the Ten Oaths—— the world is known as Disboard.