Blood Pact, a pact commonly used by vampires and werewolves for making promises...

It was set in the 1910s, where vampires killed mortals for blood indiscriminately, and werewolves were the protectors of the mortals. The vampires does kill werewolves that get in their way, and they realised that the blood of a werewolf is a millon times tasier than the mortals. They targeted the werewolves, and both parties ended up in heavy casaulties. To cease the fighting, the Vampire Princess offered to sign a blood pact.

The Blood Pact, made by vampires and werewolves, vampires are not to harm the mortals and werewolves are not supposed to kill any vampires.
Vampires' side are to surrender the Princess' ability to fight and her health
Werewolves' side are to surrender the Prince's immortality
Signed: Vampire Princess and Werewolf Prince

However, in the year 2010, vampires started to violate the pact and the war between vampires and werewolves starts!

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Cast:

Hebe
Identity: Vampire
Age: 220
Stopped ageing at 19
Ability: Force field
Aura: Orange
Short intro: Trying her best to cease all the fighting, but it is inevitable.

Arron
Identity: Mortal
Age: 20
Short intro: Does not believe in vampires and werewolves, but was dragged into the picture due to his sister, Guigui.

Jiro
Identity: Vampire
Age: 220
Stopped ageing at 19
Aura: Blue
Short intro: A loyal servant of Hebe, hates werewolves to the core.

Selina
Identity: Half Vampire
Age: 180
Stopped ageing at 19
Aura: Pink
Short intro: Known for cold blooded and never shed tears. Due to some reasons, hated vampires a lot.

Prince
Identity: Werewolf
Age: 220
Stopped ageing at 19
Ability: Heal
Aura: Purple
Short intro: Always sigh when Jiro & Selina bicker. Only allowed to transform limited times into a werewolf.

Guigui
Identity: Mortal
Age: 19
Short intro: Believe in werewolves and wanted to marry one when she was young. Almost everything is cool to her.