"I am not human.
I am one who stands above man.
An existance that forgives man's sins.
Sins of man cannot be forgiven by man.
I, however, can forgive man.
I can forgive thee."
"Impossible.
It's too late."
Hint: the voice actor of Rossiu Adai also voices a character in this show.
Here are some more hints. And I also give an additional quote from the same anime, just in case it's too hard.
Hint 2: The genre from this anime is horror, mystery.
Hint 3: This anime is based on a visual novel.
"Damn it.
I will live past June 1983.
And then I'm going to grow much taller.
My breasts are going to get bigger.
I'm not going to stay in a child's body for the rest of my life!"
A given mission, mechanical assault, manufactured devotion.
Red eyes, an upside-down form. Even the twisted shape was made to be that way.
No matter how cruel the slaughter, worse than a demon's,
or how gentle the kindness, greater than an angel's,
a machine has neither will nor madness—only code, and a few bugs.
So why, then, does it feel so unbearably sad?