Ruka

is a kunoichi of Kirigakure.

Shinobi World War Arc
As the reincarnated shinobi reappear on the battlefield, most of the Third Division is scattered into small squads. Ruka is part of a squad led by Monga, who are assigned to protect the Medical and Sealing squads. Ruka promises to Monga to she will sacrifice herself for him if something were to happen. Gari appears before the squad and after a short fight, is blown up by Monga. Ruka and the squad look in shock when Monga is mummified by Pakura. Maki explains to Ruka that she was once the kunoichi's student. After revealing her death at the hands of Kirigakure, Ruka explains to Pakura that the "Bloody Mist" is no longer the murderous village it used to be thanks to the Fifth Mizukage, however Pakura does not think that it will erase the past. Pakura begins to attack the squad and incinerates the area to find the hiding shinobi. The squad protect themselves from the blast with Maki's Cloth Binding Technique and Ruka's Water Release. Pakura finds the squad and prepares to kill them until the arrival of Omoi and Zaji. As Gari's regeneration is finished, he joins Pakura in fighting the shinobi but having a change of heart, Pakura allows the squad to flee while holding Gari's movements.