Summary: Toujyou Masaki; hush little baby, don't you cry; Papa loves you and is going to die.
Too Late To Apologize
Toujyou Masaki looked down on his daughter, and contemplated what he was about to do. He was about to prolong the life of one who was destined to kill humans for the sake of the earth. Kazuki would be forced to fight and kill and would likely go through pain and suffering before dying horribly.
But he couldn't just stand there and let her die. She was his daughter, his flesh and blood, one of his most precious people. For the sake of the life she should have had, he would give her his life, his body, his DNA, and she would live.
He couldn't get her away from the coming fight, but he could let her have another chance at life before she was thrown into the fight. For her sake, he laid down his life willingly, letting his father experiment on them both to save Kazuki.
"I love you, Kazuki."