Black Cat: Kuro Neko and Tsukiakari Ookami!

Alexis Arks is young 19-year-old girl whose well known as Tsukiakari Ookami AKA Moonlight Wolf and Chronos Number 11, but only Numbers 2, 7, and the heads of Chronos know that she's Number 1; Sephiria Arks' adoptive younger Sister. Alexis has know Number 13 since they both joined Chronos, but they both soon find there's a life away from all the killings. TrainxOFC