Knock. Knock. May we come in?

Alex was shocked. What kind of power was this? It was no wonder that they were able to become so powerful in such a short amount of time. 

While everyone was risking their lives hunting down beasts to improve themselves, these guys were simply kidnapping the weak and the helpless and becoming stronger by sucking their blood.

Alex was getting pissed off just thinking about this. "This is ridiculous! Completely unfair!" She stomped on the ground.

"Ummm… Miss Alex… Sorry, but I think there is something else. A catch." Shin Shoo interrupted her. 

He was a level-headed person, so he was able to notice this before others. "Is there a limit to the stats they can gain through this method?" He asked the vampiresses.

Alice nodded. "Yes. We need to keep drinking blood from stronger beings in order to gain stats. Otherwise, our growth will stagnate."