Tenshi Kinryouku, Vampire Juujikai Recommendations
Both stories are heavily character focused showcasing the many interactions and relationships where a reader it able to identity each characters opinion of each other. The plot of both also involves factions of supernatural beings, showcasing their unique worlds and culture. Where the story goes to slowly divulge the history of events and truth behind characters past. Both carry a very similar vibe and are highly recommended for fans of supernatural and fantasy-like stories with big focus on character relationships.