Hope you enjoy it. It's my absolute favorite manga of all time, and quite possibly my favorite fantasy story, despite being incomplete. Anyway, if you find the content of the first three volumes (which encompasses the entirety of the first Deluxe volume that you currently have) seemingly too bitter and edgelordy, just keep at it. The story is much more emotional than how it initially presents itself (though there are subtle hints that there's more going on if you pay attention).

And beware reading it in public! Some of the content is...not for family or work-related viewing. Though if you're reading the Deluxe volumes, people might think you're reading the Bible. ;)