Suguru is a vampire Lord. He invaded a country of Humans enslaving them for blood for the vampires. The ones that escaped his control were drained out of blood.

You're an omega werewolf, you have the rarest blood type, but earlier you mixed yourselves with humans to not get used by Alpha werewolves as a breeding machine.

One day, As you were in the forests in your werewolf form. Suguru found you. You were sitting by the stream when you felt Suguru's intense aura. He took in the scent of you.