Odyssey of the Guardian Emperor

From the back cover

Set in an alternate world where humans are born with a connection with guardians, mystical beings with various powers. Odyssey of the Guardian Emperor follows Alaric an orphan boy who happened to have been born with a rare S-class guardian and has inherited a plethora of enemies because of that. A traumatic event in the past sparks Alaric's ambition of bringing an end to demon-kind, a race of beings whose only purpose is to destroy and reap the lives of the innocent. His journey, however, soon leads him to unexpected discoveries. How will Alaric handle the truth about his world where the borders of good and evil have merged into one bloody mess with a history of strife, death and tragedy?

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Long story short, everyone's born with a guardian. It could be anything from a menacing tiger the size of a fortress to a cute innocent bunny that can petrify you with a single stare. Our main character, Alaric, and his friends are attacked by a demon at the age of eleven. Experiencing great terror, his guardian awakens and rescues him but not before one of his friends has been murdered by the demon. Armed with what could be the most powerful guardian, an S-rank guardian that's not been seen in fifteen years, Alaric and his friends train with one goal in mind: Eradicate all demons and put an end to the Demon King. This ambition will lead them on a perilous journey during which the whole continent of Valeria will be turned upside down.