Possibly the most tightly written manga ever, bar none. Every time I reread it I discover something new. The setup and payoff is immaculate. It's so rare in a world where most authors end up writing week by week.
Too long, too repetitive, too messy, characters too cold and boring. Read this only if you want to pleasure yourself with never-ending misery and suffering. If you want a bit of grace, read something else.