Hunter X Hunter: Phantom Rouge (2013) Anime Watch

Kurapika became a Hunter to take vengeance on the Phantom Troupe, a gang of thieves who massacred his clan. The Phantom Troupe sought out the Kurta Clan for their eyes, which turn scarlet when they get agitated. An unknown party has stolen Kurapika's "scarlet eyes," but Kurapika's life is saved with the help of Gon, Killua, and Leorio. The Phantom Troupe stands before Kurapika and the others, who are about to discover the true identity of the person with the No.4 spider tattoo.