Strange (Kuro x Oc)

Summary: It's been almost two years since Mahiru and the others defeated Tsubaki. Mahiru is now 18 years old and finishing up his final year of high school. For the most part, the sloth pair's lives have been pretty normal. But things soon go from somewhat normal to strange when all of a sudden a serial killer, dubbed by the public as Kyūketsuki, popped up seemingly out of nowhere. In fear that Tsubaki has returned, Mahiru, kuro, and the others begin to investigate these vampire attacks. The idea that some unknown servamp or subclass has been responsible for the recent attacks is not something they can let slide. But it seems that the gang may have just gotten themselves involved in a whole new lot of troubles. Good luck guys.
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Just so everyone knows before reading, I've only watched the anime. I have not read the manga or watched the movie and so this story takes place after the anime ends. I guess you can consider this like an au or the story is taking place in an alternate
A Chaotically in love remake