Fairy Dance arc: Zero Two's fiancee and [Domestic AbuserDio Brandokidnaps her and attempts to force her into marriage, so Inosuke has to play Alfheim Online, of whom Dio is the chief game developer, to rescue Zero Two, aided by his cousin Koneko Toujou and her friend Shoyo Hinata.
Phantom Bullet arc: Inosuke is contracted by Naraku to play an FPS game called Gun Gale Online, in order to investigate the real-life murders of some of its players. Goro Akechi is apparently behind the murders. Inosuke meets Fujiko Mine, and together they team up to hunt down Akechi. Fujiko's friend Ken Kaneki is creepily obsessed with her and is also one of the three people who control Akechi.
Caliber arc: Inosuke, Zero Two, Nana, Sanji, Derieri, Filo, Koneko and Fujiko go on a quest to acquire the prized sword, Excalibur, while being guided by Sango, who tasks them to save Sailor Saturn(who turns into Younger Toguro), and defeat the frost giant Nappa.
Mother's Rosario arc: Zero Two befriends Tatsumaki, considered one of the strongest players in all of ALO, and helps her guild defeat a boss before AIDS claims Tatsumaki's life. Zero Two's mother Rei Ayanami, wants her to focus more on real life than virtual games.
Fairy Dance arc: Lucy's fiancee and Domestic AbuserDeath the Kidkidnaps her and attempts to force her into marriage, so Eren has to play Alfheim Online, of whom Death is the chief game developer, to rescue Lucy, aided by his cousin Saki Mikajima and her friend Amanda O'Neill.
Phantom Bullet arc: Eren is contracted by Jotaro Kujo to play an FPS game called Gun Gale Online, in order to investigate the real-life murders of some of its players. Numbuh 1 is apparently behind the murders. Eren meets Yoko Littner, and together they team up to hunt down Numbuh 1. Yoko's friend Makoto Tachibana is creepily obsessed with her and is also one of the three people who control Numbuh 1.
Caliber arc: Eren, Lucy, Hinata, Shiro, Sayaka, Chiaki, Saki and Yoko go on a quest to acquire the prized sword, Excalibur, while being guided by Kallen Stadtfeld, who tasks them to save Tiki, and defeat the frost giant E. Honda.
Mother's Rosario arc: Lucy befriends Ryuko Matoi, considered one of the strongest players in all of ALO, and helps her guild defeat a boss before AIDS claims Ryuko's life. Lucy's mother Konan, wants her to focus more on real life than virtual games.