After crash-landing on an alien planet, the Robinson family fights against all odds to survive and escape. But they're surrounded by hidden dangers.
100 years in the future, when the Earth has been abandoned due to radioactivity, the last surviving humans live on an ark orbiting the planet — but the ark won't last forever. So the repressive regime picks 100 expendable juvenile delinquents to send down to Earth to see if the planet is still habitable.
In a world populated by anthropomorphic animals, herbivores and carnivores coexist with each other. For the adolescences of Cherryton Academy, school life is filled with hope, romance, distrust, and uneasiness. The main character is Regoshi the wolf, a member of the drama club. Despite his menacing appearance, he has a very gentle heart. Throughout most of his life, he has always been an object of fear and hatred by other animals, and he's been quite accustomed to that lifestyle. But soon, he finds himself becoming more involved with his fellow classmates who have their own share of insecurities and finds his life in school changing slowly.
In the near future, a Virtual Reality Massive Multiplayer Online Role-Playing Game (VRMMORPG) called Sword Art Online has been released where players control their avatars with their bodies using a piece of technology called Nerve Gear. One day, players discover they cannot log out, as the game creator is holding them captive unless they reach the 100th floor of the game's tower and defeat the final boss. However, if they die in the game, they die in real life. Their struggle for survival starts now...