Opening: The S-Class and F-Class hunters I raised.
And not just any F-Class, but a useless, pathetic older brother who holds back his successful S-Class younger sibling.
After living a haphazard life that turned into a total mess, I ended up devouring my own brother's life before returning to the past, receiving the title: 'The Perfect Guardian.'
Alright, this time I won't act up and will just quietly take care of the slackers. Or so I thought, but the S-Class hunters are acting a bit strange...