Gabriel became a priest to seek forgiveness. First, he is haunted by his guilt believing that he caused his friend's death. Second, his body is easily swayed by lust. At least, the latter is triggered by a sudden arrival of a philanthropist who is actually a vampire. The thousand year old vampire, Paolo, took a liking to Gabriel and continually tempted the priest. Often, he would also delude Gabriel of seeing his dead first love (or how he would look like if he wasn't dead). Yet unknown to the two, Saliuo, Gabriel's first love and actually a werewolf, is alive and striving to fulfill a long-fated curse casted by his ancestors. It gets complicated along the way since Gabriel isn't actually just a priest and there's a reason why he had the sun's stone which Saliuo took from him when they were young.
Sun's Blood