Rei Andou, a young man who found himself trapped in a world of technology he never imagined before. He is the strongest Solo Player in the game [GrainSword Online]. He is often considered the [Last Boss] by most players in GrainSword Online—this is because of the position he holds as the Dungeon Master. His status as a Solo Player is also one of the reasons why he is referred to as the [Last Boss]. A magical circle appeared, surrounding him and the throne he was sitting on. Believing that the conquering player was the one who cast the magical circle, he calmly ignored it without panicking. However, what happened next was not what he expected. He was thrown into another world, with the appearance and title he had at that time. This is the beginning of Rei Andou's journey, thrown into a world he had never known before.