The Blood Pact Game

Victor, the vampire king of the northern lands who's lived for a thousand years, grows weary of eternal life and anonymously posts a billion-dollar bounty on the dark web, recruiting someone to assassinate him. Ella, an orphan assassin raised by the blood-hunting organization 'Silver Blade', takes on the mission, hoping to use the bounty to gain freedom from the organization. But she completely fails when she sneaks into Victor's castle to kill him.