It looked like he was about to gain another mistress.
"Will this let me defeat the Black Dragon?"
Without the slightest hesitation, it seemed that in Ais's eyes, the only thing that mattered was whether she could defeat the Black Dragon after accepting William's transformation.
"Though I haven't seen the Black Dragon myself, after the transformation, with that monster-slaying skill of yours and paired with Yukina, there shouldn't be any problem."
Although the Black Dragon was the strongest monster in this world, in his estimation, this Black Dragon probably was not all that powerful.
A transformed Ais, along with Yukina, who could already fully control her angelic transformation, should be more than enough.
And if worse came to worst, wasn't he here to back them up?
Nothing major would go wrong.
"Yes!"
Just as before, she did not hesitate in the slightest. After receiving William's affirmative answer, Ais nodded directly.
"Good!"
With a light wave of his hand, William did not explain to Ais that becoming his dependent would cause her life to be influenced by him.
Because he had already seen in Ais's eyes that she did not care about anything other than that.
Faint golden particles of light drifted out from William's body, then gathered before his chest, forming a black-covered antique book.
There were no patterns or words on the black cover, yet merely floating there, it gave Ais and Kishiryu Yukina the same feeling.
Mysterious, profound, unfathomable—and most importantly, sacred.
That was right, sacred.
The cover flipped open without any wind, and the pages began turning with a rustle. The things recorded within seemed to be shrouded in a mysterious halo. Even with Kishiryu Yukina and Ais's superhuman vision, they could not make out a single thing from such close range.
At last, the pages turned