The Truth Lies in his Veins

This is the story of a young boy named Alku, who's only friend is invisible

Astro was born out of Alku's imagination and was always there for him when no one else was,
He grew resentful of the world and began to crave revenge

When Alku refuses to resort to violence to fix his problems, Astro feels shocked and betrayed, he collects and steals energy in order to gain control of His host until he is no longer simply imaginary.. what is going to happen..?