.hack//Legend of the Twilight (2003)

Set in a fictional MMORPG, The World, the story follows Shugo and Rena on their adventures throughout The World. Mysterious invincible monsters and bugged areas appear throughout The World, prompting Aura to give Shugo the Twilight Bracelet, sending him and Rena on a quest to unravel the mystery of the bracelet and Aura.