The story that introduces us to the anime-inspired world that is Bitter Waters Suite. A world populated by human/vampire hybrids created to wage and win a war against vampires and the armies of the dead that follow them.
In Episode Zero we meet the most powerful of all the Hybrids, Zero, and the enemy of life everywhere, Alice — a sacred class vampire that has plans to no only to consume life on her version of earth, but every level of existence.
Bitter Rain, finds Zero waking from a longer sleep than usual with the knowledge of traders among them and the fate of number 2, Hanna, who has been missing for days. Aided by number 8, Thetis the assassin, Zero rains suffering and death upon those who have chosen to side with the S class vampire Alice.