Second season of Xing Chen Bian.

Gin is a silver Tora-ge named after his coat color. Shortly after being born, he watches his father, Riki, get killed by Akakabuto, a bear that terrorizes everything in his path. Being the third-generation of bear-dogs to try to stand up against Akakabuto, he ventures out to find dogs to join him in his fight.

Years ago, humanity almost got wiped out by huge magical armored insects that had become too strong and aggressive to handle. Because of these giant bugs, humans do not live on the earth anymore, but in floating cities instead. However, this does not mean that everything is lost, because the wizards from prestigious floating wizard academies are fighting these monsters. Kanata Age is a young man now labelled as a traitor even though he was once praised as the "Black Master Swordsman." He gets a chance to repair his reputation by instructing the team E601, which seems to be facing some difficulties. It consists of three girls, Misora Whitale, Lecty Eisenach, and Rico Flamel, each with problems of their own. It appears that Kanata will get in deep waters more than once because of them...

The seal which was imprisoning the fallen angels, Kirin no Yuda and Houou no Ruka, is broken and the two decide to get revenge on the God who had cast them to Hell by getting rid of the Heavens that had once been their home. Soon the guardian angels on Earth begin disappearing, and no one in Heaven can explain the happenings. But there is a sense of a vengeful animal spirit at work, and so the four Saint Beasts are called upon to investigate. The 4 Gods of Beasts attempt to rescue the guardian angels, as well as to find out what this evil animal spirit is... (Source: Wikipedia)