Yami no Sen Ou ~Seijo Ojoku~

To forever rid the world of the vampire lord known as Drake, the Catholic Church unleashes two highly experienced vampire hunters in a bid for final victory. Taking the battle directly to his vile homeland, the divinely ordained combatants have been ordered to show no mercy or quarter to their undead enemy, and bring swift holy retribution to that which affronts God’s devoted followers. Yet in their blind zealotry, they discover all too late that evil is never powerless against those who would deny it.

[From old Nargrakhan review]