I began reading the manga on the recommendation of a friend before the first episode of the anime adaptation aired but after the promising PV for it dropped. I keenly remember not enjoying the plot at all to begin with, and the art is initially horrible, probably even worse than the rotoscoping in the anime.

I persevered with it, however, since this particular friend is yet to supply me with a poor rec, and gradually, the art has become quite pretty, and the story has also developed into an entertaining rollercoaster of events and emotion. I think it improves so much that of currently running manga, AnH is the title I anticipate new chapters of the most out of 50+ I'm following, and it has been consistently so since I first caught up, with each new monthly chapter delivering drama and excitement in spades.

Since the anime's sales were amazingly poor, there will never be a second season, and imo the story only really becomes enjoyable a fair while past where the anime stopped, so I would recommend reading the manga if you ever plan on revisiting the franchise, or for anyone else who wants to pick it up.

As it isn't finished, it could still turn to shit, but it's pretty great right now.

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Edit made months later: It turned to shit. No longer recommended.