Rokudou Reika, Master of Black's Assassin, female.
Among the Black Masters, she was the only one who was not a member of the Thousandth Tree clan. She had been a refined young lady in childhood, but after her parents died in an accident, her life began to go downhill due to various factors. Now, she worked as that thing for men to do that thing.
That unlucky man was Sagara Hyoma. He used suggestion to control Rokudou Reika, then exploited her to perform the ritual to summon Jack the Ripper after gaining her trust. However, Jack was summoned before Rokudou Reika died, and she beat Sagara Hyoma to the punch by forming a contract with Jack.
The unfortunate Sagara Hyoma, the summoner, had his jaw and hand dislocated the very next moment, while Rokudou Reika naturally became the Master of Black's Assassin.
It was ridiculous, but true.
This woman could be called a one-of-a-kind natural genius and natural monster. Her understanding and observation of things were extraordinary. Even lacking weapons and magical energy, she continuously maintained Assassin's advantage and calmly slaughtered magi. Before leaving Japan, she had also joined Jack in defeating Thousandth Tree's assassination squad.
Oh, right. Because she had killed too many magi back then, she still had not finished eating all the hearts. One of the remaining ones was wrapped in plastic and stored in the refrigerator.
At the hotel where Rokudou Reika and Jack were staying, the Master and Servant were having dinner. Although this dinner was absurdly late, it was indeed dinner.
Since Jack's hand had been wounded by Chiron's arrow in the previous battle, her Master, Rokudou Reika, could only feed her now.
"Mom, did the wind start blowing in the room?" A sudden current of air appeared in the room, and Jack asked