I've read this a long time ago and don't know if it was because I was too immature to understand it or maybe I didn't think like that because I didn't even remember this story, but it's freaking good!
What I think it's beautiful about this is how Kai gives everything up for Hizuki. He's not sure whether or not he loves him, at first, but is still willing to be by his side because he can't bear to see him suffer. It's almost as if he loves him so much, he can't see his sorrow, even if he doesn't know the reason. I kept thinking about the whole situation and came to new conclusions time after time. Like, Kai had no certainty that Hizuki would be with him even if he followed him, but he still did, no matter if he could lose everything. He couldn't go back to Miharu because he didn't love her anymore, even if she would've accepted him.
BUT! I don't believe in love at first sight. Sorry, I just don't. So this story isn't as convincing for me as it may be to more fantasy-driven people, so I can't rate it the highest.
As for Miharu, she feels evil to me since the beginning, almost as if she planned it all... She was smiling when she was telling Kai about how she convinced Hizuki to keep a part of his friend alive.
Though I liked this manga, I have a few complaints. For starters, an art-related one: why the hell did Kai change his hair cut?! He looked so much better with the old one! I'm sad. And it makes the meaning of the story less impacting, because Kai looks exactly like Hizuki's lover, besides from having a similar personality too. It would've been more original if he was totally different from him - physically and psychologically.
And the dialogues - rather, the order of events - were a bit confusing at parts.Though Hizuki refers to Sugiura as "a friend", Kai keeps saying "his lover" and it was't very clear for me until the last chapter. Other than that, Hizuki doesn't say he loves Kai, until he suddenly declares he fears for his happiness the more he loves him. Since when? And what's even more strange is that Kai doesn't have any reaction to that, like he already knew he was loved. Makes me wonder if it's a translation mistake.
But what bugged me the most was how the author tried to make it longer than it should be - probably due to popularity - and it became just a little too much of that lovey-dovey thing. It should've ended with chapter three, because, you see, Ebihara-sensei even had to create a new conflict in order to continue it. I know it's tempting for mangaka to rely on the title's success, and people even like this sweet and commonness, but then it becomes just one more, not remarkable. So, unfortunately, this remained my stronger opinion about Allure. It's not like I didn't like the chapter, because I did. I just think it wasn't necessary.
As for Sugiura's and Hizuki's past, I loved it. I cried my heart out and liked it even more than the main story. That is what remained remarkable for me, the kind of story that messes up with my mind.
Another problem - that isn't the mangaka's fault - are the scanlations to this manga. They were really lousy, with pages in the wrong order and a lot of spelling mistakes. Here at Baka Updates too: chapters 2, 3, 4 and 5 are missing here, and yet it's in the "completely scanlated".