Raiders manga

Raiders summary:

From NS: "A boy named Irel investigates a ruin with professor Wilter Langhem and finds the blood of Jesus inside a chrism bottle--which makes you immortal if you drink it. After being chased by armed men guarding the ruin, Irel and the Professor ride a train to London. And on the train they're attacked by a mysterious girl who turns out to be a zombie! On the verge of his death, Irel drinks the blood of Jesus! What will happen to Irel? Read the manga to find out."