Kimera

In the post-apocalyptic world that Earth has become in the 21st century, monsters, mutants, and demons all roam the land looking for human prey. Kakugo and Harara have been trained by their father in the ancient Zero fighting technique, to protect the last remnants of humanity, and restore hope and peace on Earth. Powered by both their superior fighting skills and their secret techniques, as well as special living armor made from the souls of ancient warriors, they are sent into the world to defend the weak from demons and mutants who savagely attack and destroy human life. Yet, with all their training, Harara succumbs to the evil within, killing their father and believing Kakugo is dead as well. But their fates are still intertwined. Kakugo comes to the remnants of a city to help the few human inhabitants. As he saves them from the ravages of cannibalistic monsters and depraved mutants, he once again encounters his psychotic sibling, and the bloodiest battle of the 21st century brings new meaning to Sibling Rivalry!

A race of cannibal monsters called the Shokujinki exists and it is the job of the Kifuuken, an elite group of beast-hunters, to stop them. Toshihiko Momota, an expert swordsman and son of the Kifuuken organization's leader, unexpectedly falls in love at first sight with a beautiful girl named Yuka. However, the couple's relationship is much more complicated than it seems at first glance, for Yuka is a Shokujinki.

Two scientists are attempting to distribute the cure for a demon virus that is affecting people all over Japan, however, things have become complicated. One of them has become infected. So begins his battle with himself, as he attempts to not only control his emerging demon side, but also to save the lives of others by wielding its great strength.

Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons. Season 1, Episode 13: Haruna is given the task to hold a Spring Festival at the local shrine, in her own magical-Equipment-girl way, of course... Seraphim does not want to be a freeloader at Haruna's and Ayumu's place, so she starts cooking... And a concentration-game contest in the school's main assembly hall pushes Ayumu and Orito to their limits... Season 2, Episode 0 part 1: Haruna wants to play more with Hellscythe at a swimming pool Season 2, Episode 0 part 2: Hellscythe's birthday is near! Haruna prepares a birthday party for Hellscythe in her own magical-Equipment-girl-way. What kind of party could Haruna be holding? What kind of birthday presents will Ayumu and gang give to Hellscythe?