What is the fine-grained topic of the following text: When Kira comes across an ancient dagger that belongs to Khefar, a 4,000 year-old Nubian warrior, the sexual tension between the two builds, and a sinister evil sets its sights on them both. Only return the topic.
A romantic relationship developing between Kira and a 4,000-year-old Nubian warrior, Khefar, amidst a supernatural threat.