Yuki Takeya, Kurumi Ebisuzawa, Yuri Wakasa, and Miki Naoki decide to stay over at school. Along with the school adviser Megumi Sakura, they suddenly find themselves to be the final survivors of a zombie attack, and continue to live and survive at the school.

When a strange man in a grotto offers fifteen middle-school students the chance to test the game he's been developing, the kids find little reason not to accept. Who wouldn't want to pilot a giant robot and face down intruders bent on destroying Earth? Instead of a game, however, the youths discover that the metal giant is all too real--and so are the enemies! It only gets worse when they realize that the 'contract' they signed to play the game was no laughing matter. The robot feeds on the life force of its pilot. Even if they win, they die. But if they lose, the world will cease to exist!

Shu is a typical Japanese boy, but has an unbeatable, optimistic and determined attitude. However, when he sees a mysterious girl with strange eyes named Lala-Ru up on a smokestack, he is soon pulled into a strange desert world. Shu soon discovers the true terrors of war, which includes genocide, brutal torture, hunger, thirst, and child explotation. Now Shu is trying to save Lala-Ru, as well as his hard earned, and often relunctant, new friends from the insane dictator, Hamdo. Whether Shu can possibly accomplish saving those he cares about while still holding up to his values remains to be seen.

Born into a world 1000 years in our future, Saki and her friends live in utopia. Not only is their idyllic community overflowing with resources, but technology is obsolete, thanks to a magical power that grants the ability to materialize anything. However, when Saki discovers a lost artifact, the facade is shattered! Faced with a startling truth about their town, Saki and her companions face dangers they never knew existed, and their choices may change the fate of everyone.

Located in the center of a remote island, the Abyss is the last unexplored region, a huge and treacherous fathomless hole inhabited by strange creatures where only the bravest adventurers descend in search of ancient relics. In the upper levels of the Abyss, Riko, a girl who dreams of becoming an explorer, stumbles upon a mysterious little boy.