Kaibutsu Oujo, High School DxD Recommendations
very similar, that is there's fighting between, for highschool their own kind, for princess their family
the main character died and got revived by his master.
the master really cared for the the main protagonist
and there's demon/vampires
both about the main guy dieing and then being bought back by a powerful vampire to serve and protect her from other supernatural beings.
both are also very funny.
Both series features a protagonist with his life being completely changed after a certain event in the series.
Both anime features several different women with different motives but all seems to have affections for the main protagonist, at various levels.
Both series contains comedy, drama, action, as well as some romance.
Unlikely hero boy meets paranormal princess and becomes her eternal servant and they secretly have feelings for each other. Princess Resurrection is a lot more PG but the servant process is more interesting in PR and makes a good plot concept.