Several months after a probe returning from Mars burns up during reentry, strange creatures dubbed "Ancients" begin to appear throughout Tokyo. Aggressive and dangerous, they cannot be killed with ordinary weapons. As scientists struggle to find the cause of their sudden appearance, the monsters wreak havoc across the world. Humanity finds hope in the form of the MARS suit—a new weapon developed to take down these enemies. The suit, however, can only be worn by those with specific DNA. Enter Takeru Hinata, an ordinary teen with a troubled past and one of the few capable of piloting the only weapon against the Ancients. With the help of the AAST, a special police force established to defeat the dangerous creatures, the young man battles against demons both personal and global whilst trying to discover the true nature of Earth's new aggressors.

Neverland is a world where humans, demons and dieux live peacefully. Lord of the Kingdom of Bjor, wants to conquer the world... Anime based on the online game "Kingdom of Chaos (K.O.C.)". (Source: AniDB)

Unaired episode 13 of Choujigen Game Neptune: The Animation, included in the 7th BD/DVD volume.

In the world of Neverland, humans and monsters live alongside each other. Generation of Chaos details the start of the adventures of the two heroes of Neverland, Chiffon and Roze. Departure of Chiffon Chiffon is a boy with the power to train monsters. After realizing that his power is waning, he sets out to Hiyoko Forest to return his Hiyokomushi—a fish-like mount and companion—back to its homeland, the Hiyoko Forest. However, the journey there is anything but uneventful as his control over his monster gradually loosens. Roze's Decision Roze is of half-demon descent, living a quiet life among humans with her sister Emilia. One day, as Roze returns from work, she sees her house being set on fire.The destruction of her home shatters her dream of being able to live peacefully with humankind, as she is reminded that harmony between demons and humans is far from becoming a reality.