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«Vertical Square» (バーチカル・スクエア, Bāchikaru Sukuea?) is a 4-hit Combo One-handed Straight Sword category Sword Skill in Sword Art Online, New ALfheim Online and Project Alicization.


Vertical Square is activated with a powerful stamp. The first strike of this Sword Skill is a vertical slash without a backward motion, similar to the 1-hit Vertical. This slash is followed by a left to right swing from below and then a vertical slash down. Finally, the skill is concluded with a full-power overhead slash (uppercut)[1]. Similarly to the Horizontal Square, a square is drawn with the 4 hits of this skill and continues to spin as it dissipates[2].



  • Vertical Square is one of Kirito's most favourite Sword Skills.
  • The anime portrays Vertical Square as more of a diagonal or even horizontal square, despite it having "vertical" in its name.


  1. Volume 10 Chapter 4 Part 5
  2. Volume 1 Chapter 9