Canon film that introduces technology and characters relevant to Alicization .
The "War of Underworld" sub-arc is divided into two main parts:
Episodes 1–24. Ends with the battle against Administrator.
To fully understand War of Underworld , you should follow this sequence:
Episodes 25–47 (often split into Part 1 and Part 2). Plot Arcs & Synopsis
Establishes Kirito, Asuna, and the core cast.
Sword Art Online: Alicization - War of Underworld is the climactic second half of the Alicization arc, adapting volumes 15–18 of the light novels. This guide covers the essential watch order, plot arcs, and key characters.