"Sword Art Online: Aincrad Night of Kirito" is a manga adaptation that delves into the events of the Aincrad arc from the "Sword Art Online" series, focusing on the protagonist Kirito and his experiences within the deadly virtual reality MMORPG. The story begins with Kirito, a skilled solo player, navigating the treacherous floors of Aincrad, a floating castle where players are trapped. The game's creator has designed it so that death in the game results in real-world death, and the only way to escape is by clearing all 100 floors.

Kirito initially isolates himself, believing that his strength and independence will protect him and others. However, his perspective shifts after encountering Asuna, a highly skilled player who becomes his partner and eventual love interest. Together, they form a formidable team, tackling challenging dungeons and bosses while forming bonds with other players. The narrative explores their growing relationship, as well as Kirito's internal struggles with guilt and responsibility, particularly after a tragic incident involving a guild he briefly joins.

The manga highlights key moments from the Aincrad arc, including the duo's rise through the ranks, their involvement in the frontline battles against floor bosses, and their eventual confrontation with the game's creator, Kayaba Akihiko. Themes of survival, trust, and the blurred lines between reality and virtual worlds are central to the story. Kirito's journey is marked by his evolution from a lone wolf to a leader who fights not only for his own survival but also for the lives of those around him. The manga captures the tension and emotional stakes of the original light novels while presenting the story in a visually engaging format.