Shinpu wa Yoru no Hanayome

Shinpu wa Yoru no Hanayome summary:

The innocent and beautiful priest Sera secretly loves his good friend, who will be married soon, even though he devoted himself to G.o.d. One stormy night Jin, a vampire in black, makes his appearance, as if he feels drawn towards this impure and polluted blood… With sweet words he seduces Sera into sin, but what is he really driving at?