Keep the tissues from #6 handy. CLAMP ain't finished with us yet.
Goodness as if the last Omnibus didn't rock us enough, this one just keeps the twists and punches coming! Some really great psychological things are done with the characters at this point. I 100% believe them and their decisions, especially Sakura. Her development is fabulous, and she's starting to become less of a "damsel in distress" and more of a strong woman taking back her life.
Ultimately, though, this Omnibus is all about Fai, which we knew had to be coming at some point. His backstory is finally revealed to us and, man, if you thought Kurogane's was rough, this one is about to break your heart into a million pieces. This one can be a little confusing too. There are lies, dual perspectives, curses, and timelines to keep track of. I suggest thinking through the reveals in this Omnibus before moving on to make 100% certain you understand what was going on with Fai throughout the series. This will absolutely change your perspective of both him and the plot as a whole. I might even go back and reread parts of this Omnibus just to make sure I understand what was going on.
Still some violence and blood, though not as bad as the last one. But really intense and very sad storyline. So brace yourself.