Mankind of the far future has perfected faster-than-light travel, exploring the stars; space, however, is a perilous expanse wherein gigantic monsters burst forth from mysterious rifts-heavenly gates. Such beasts tear galaxies and devastate whole planets, and their existence is a threat to the very existence of humankind. Only the elite Beast Tamers can subdue such creatures and form strong bonds that protect their worlds.
Now, Elias Stroud is an ordinary clerk who struggles to make ends meet in a world that worships Beast Tamers. On one fateful night, an event of the Heavenly Gate only led him to save a mysterious woman. The course of his life turned another direction since that incident. This woman proved to be Celestia, one of the Realm Lords, humanoid embodiments of the twelve most powerful monster races in space. Little did anyone expect that Celestia would kiss him and awaken the dormant potential within him to become the prophesied Beast Lord.
