This set contains Sword Art Online volumes 21 to 23. The novel tells the story of mankind finally realizing complete virtual reality in 2022. The protagonist Kirito wears NERvGear and comes to the virtual world and is trapped in it. In order to escape, he engages in a battle with no end in sight. The theme is a popular online game theme in recent years, but it is different from ordinary online adventures that are deviated from reality. In the plot, the protagonists are trapped in a closed online game world due to a conspiracy and cannot exit. In order to find out the truth of the conspiracy and save the lives of thousands of players, the male protagonist Kirito and his partners work hard in the world "SOD" that is different from traditional adventure stories and is full of online game elements.
