A man taking pity on an innocent yet deadly monster and raising it as his own. It comes to love him and he comes to love it. But as it grows older, its nature begins to take hold. The man does his best to ignore it and hope in his child. This hope ends up causing the death of thousands. In the end, the man is forced to kill the monster, his child, who only did their horrific acts out of a genuine love for him.

Then BAM reincarnation and the monster ends up getting reborn as a child. I can't help but wonder how they'd view their father after.