Monster Story (it could almost be read as Stupid Story if it was baka. lol) is a very odd anime... the screens with text fly by way too fast to click and stop to read them, but the art is very neat.
Its only on episode one, so Im not sure what the hell its about really. But it seems to be that these people meet gods, and they have attributes taken away from them... and I guess they become vampires of a sort. One girl has her weight taken away, another girl has her presence taken away, the boy, not sure what he had taken away.
But the kid takes this tsundere girl to meet his benefactor to help her out...
Its almost comical in parts, but I think the show it trying to take itself seriously.