As the city prepares for Halloween, Ratman walks down an alley and a strange shadow appears before him. A voice declaring itself the true son of the emperor of the European Youkai, Backbeard, Backbeard Junior, belongs to the European youkai Bat-cat. Bat-cat asks Ratman to help him collect blood for the ressurection of Backbeard. He has a reason for wanting to achieve something great. Ratman turns him down, but when the huge reward is set in front of him, he changes his mind and offers to help. But there's no way Ratman will simply do as he's told and collect blood, is there...?!
I want to prove that I can be useful.
.أريد إثبات فائدتي
Ich will beweisen,
dass ich auch zu was tauge.
Quiero demostrar que yo 
también valgo para algo.
Quiero demostrar
que yo también sirvo para algo.
Je veux prouver mon utilité.
Voglio dimostrare che posso farcela anch'io...
Eu quero provar que eu posso ser útil.
Вот и хочу доказать,
что могу быть полезным.