Honestly, I might be biased when I say this BUT this manga is a masterpiece! Clear yet developed plot, great character design & development. I've seen people comparing this to Deathnote but this is entirely different, specially the way of thinking. William knows what he's doing and is actually doing for the people.
And it in fact, worked out just as he planned, people did change! The continuation of the story where they repent on their actions (still on going) with the help of Sherlock and those who are close to them. Special points for the 3 brothers for always sticking together through thick and thin <3