Heroes (a zodiac story)

Book 1 of the Zodiac Tasks chronicles.

"The first task you need to accomplish is to become heroes on earth."

Fourteen years ago all the zodiacs died in a war. They were reincarnated as humans on earth. But they need to get back to their world because when they died, the war stopped. But the danger never went away. The only way they can go back is as they accomplished the three tasks. The first task is to get invited to the gates of Astria. And the only way they can to that is to become heroes on earth.