'The World' is the most advanced online game ever - a game full of fantasy and adventure! When fourteen-year-old Rena wins a contest that allows her to use the avatars of the legendary dot hackers known as 'Kite' and 'Black Rose', she convinces her game-hating twin brother Shugo to give it a chance. But things quickly go wrong, as the beginner players are attacked by a monster far beyond their level. Shugo is killed by it, but is revived by a strange girl called Aura. She also gives Shugo a weird bracelet, telling him that he must carry on the legend of the dot hackers; then she disappears. Together with Rena, and many new friends that he meets while in The World, Shugo embarks on an adventure to discover the secrets of this mysterious bracelet.
Both are staged in mmo gaming except .hack being more dramatic (in my own opinion obviously) and epic in a way. 1/2 prince's gender bending (main character being a girl in real life and a bishie male elf in game) actually put me off to actually categorize it as romance, but otherwise its a good manga to read. If you enjoyed any of these I'm sure you will enjoy the latter.
Misaki Suzuhara is a young girl who traveled to Tokyo to live with a relative, but ended up becoming involved in the greatest game of all time: Angelic Layer! In this fast-paced competition, players customize dolls and fight them in arenas of all sizes, hoping to gain experience and perhaps win the greatest tournament of them all! With new friends to meet and new enemies to defeat, the best time of Misaki's life seems to be just beginning. Join Misaki as she struggles to be the best, even in the face of overwhelming odds.
Sometimes, a game reaches out and grabs you, sucks you into its world. In both .hack and Angelic Layer, the players use their minds to interact with the game. In one case, a deus moves a robotic angel with mental commands, and in the other, the player interacts with digital avatar through a virtual reality headset. These are two games I'd kind of like to play. :)
Both of these are short adventure/action manga about a group of kids inside a digital world (hack's world being inside a game). They both have tons of "friendship"-type scenes, feelings for digital beings, and a few action scenes. If you enjoyed one, I recommend you check out the other.