«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). Similarly to the «Horizontal Square», a square is drawn with the 4 hits of this skill and continues to spin as it dissipates.
Vertical Square is one of Kirito's favourite Sword Skills.
The first season of the anime portrays Vertical Square as more of a diagonal or even horizontal square, despite it having "vertical" in its name.
In the anime adaptation of Calibur, Kirito used Horizontal Square instead of Vertical Square.
A modified version of «Vertical Square» was included in the updated version of «Dengeki Bunko Fighting Climax», known as «Dengeki Bunko Fighting Climax Ignition», as a special move used by Konno Yuuki.