...Then you will eat this manga with a spoon.
The premise of the manga is certainly interesting enough: two people bound by destiny to confront one another, the fate of the world hanging in the balance, etc., etc. But somehow despite the grandiose premise, neither the story nor the characters came together especially well for me. The first volume of the series focuses on Kuroto and Hanashiro getting to know one another. Kuroto is a nice guy and lives a peaceful life, which causes Hanashiro to doubt his role as the one destinied to kill him. But that destiny soon catches up with Hanashiro and by halfway through the first volume, rather than just thinking Kuroto is a gentle person who means well, Hanashiro has decided that Kuroto means more to him than the whole world(!), the fate of the world and his destiny be damned. Hanashiro is even willing to kill innocents (and in fact, does kill innocents) just to protect Kuroto.
At this point, as a reader I lost all sympathy for Hanashiro and was partially rooting against him, somewhat hopng that he'd fail in protecting Kuroto. (After all, why should selfish, irresponsible, whining brats get what they want?) To counter Hanashiro's obsession, poor Kuroto on the other hand, was portrayed as the most passive seme(?) future uke(?) I have ever seen in BL. There were character-based reasons for it, so I couldn't dislike him because of it, but Kuroto's willingness to surrender to his fate made Hanashiro's actions all the more annoying (and selfish).
But what really lowered the score for me on this manga wasn't just that I didn't especially like Hanashiro, rather it was the manga's lame attempts at providing a deep, metaphorical justification for the fate Hanashiro and Kuroto are bound in. The second half of the first volume and the entire second volume focus on providing an explaination/justification for just what the lord of the world was doing when he created this "garden" and what he hopes the combined destinies for Hanashiro and Kuroto will do for the world, etc., etc. It's all a bit dull and more than a bit nonsensical.
The artwork of the manga is quite nice, so you may want to check it out for that reason alone, but if you're a BL fan, be warned: the characters don't even so much as share a kiss (it's BL only if you squint), so for that reason you may want to avoid it. Taking the good with the bad, this ended up being a solid middle of the road manga for me: I didn't hate it, but I didn't love it either.