The characters from previous .hack//G.U. Games and .hack//Roots receive an email from Ovan. He is requesting them to go to Hidden Forbidden Festival where is set up a mysterious summer festival. There they find an AIDA Chim Chim who wishes to peacefully co-exist with the other players of The World. It then transforms into the word "Returner", so they assume it to mean that Ovan will return to The World.

The sky is the limit in Houkago no Pleiades. With telescope in hand, Subaru is set to go to the observation room of her school in order to get a view of that night's meteor shower. What she least expects is that behind the observatory door was not the starry skies, but a lavish garden, complete with a resplendent fountain and a mysterious young boy with long red hair. But the garden soon disappeared, as if Subaru was only imagining things. All that remains of that brilliant sight is an odd, bouncing blob creature that leads her to another magical door, occupied by other girls in magical witch-like costumes. Revelations start hitting Subaru one after the other: one of the girls in the room is her childhood friend Aoi, the little blob is actually an alien of a species called the Pleiadians trying to return home, and Subaru has been selected by him to become the newest member of their group! Now Subaru's dreams of the stars have come true in the wildest way, as she and her friends attempt to gather pieces of the Pleiadian spacecraft engine to return the being to his home. But they're not the only ones after the engine parts, and they have no idea why!

"Starlight" - it's a distant star, long ago, and in the far future. Two girls, who were struck by the light of the stage in this play, exchanged their destinies. "Two people's stars, waiting on stage." To burn out ordinary fun and joy and fulfill our destinies. A destiny to become a blast furnace at just 5 years old... what a danger. Eventually the two will meet again. One continued to stand on the stage of tragedy, the other jumped in, separated, jumped in, rewrote their destinies... and created a new chapter full of light. No girl was burned and fell from the tower, nor was she imprisoned. Then... what is the end of that new chapter? "Starlight" is a story of an unknown author. Where does the light come from and where does it go? And who is "starring" in this story? I want to see it. Hey -- Hanako Aishiro, a third-year student at Seisho Music Academy?

In Penguin Village, humans live alongside talking animals and objects. Senbei Norimaki is one of these humans, and he's an inventor with the lofty dream of creating the world's best robot girl. The product of his efforts is Arale, but depending on your definition of perfect, she's anything but! Not only is Arale severely nearsighted, but she also has no common sense! At least she has super-strength, though that often proves to be a setback as well. Although she means well, Arale only causes trouble for her neighbors in the whimsical Penguin Village!