Set four years after the .hack games, the manga follows the adventures of a pair of twins--Rena and Shugo. The story takes place in a fictional MMORPG called The World. After winning a contest, Rena is in possession of a pair of chibi avatars in the design of the legendary .hackers known as Kite and Black Rose. After an odd occurrence, Aura appears and gives Shugo the Twilight Bracelet. Shugo embarks on an adventure to find Aura and unravel the mystery of the Twilight Bracelet, An item that both aids and hinders those involved with it. Along the way, Shugo and Rena meet many friends including Mireille the rare hunter, the fierce Ouka, and the peaceful Hotaru. One night, while waiting for an event to start, Shugo and friends encounter a strange girl named Zefie. Zefie is lured to Shugo because she believes the bracelet smells like her mother, Aura.