I picked up this book without realising that it was only the first volume. This, combined with the fact that the story really does seem on track to wrap up by the end, resulted in a very frustrated reader. But the next book is at least out already, so I haven't fallen for that trap again. 
 This is a story about choices. The main character receives a letter from her future self warning her that one of her friends will die, and providing her with instructions to prevent that from happening. But while Future-Naho may believe that she has an accurate grasp of all the causal chains, there's much that she can't know even from her vantage point. Especially once the story starts to unfold differently as Naho makes different choices, and Future-Naho's experiences become less and less accurate. 
 It's a concept that's certainly been done before (I grew up on Quantum Leap, and other shows like Early Edition have covered similar ground), so the story swims or sinks on the strength of its characters. 
 And I have to say that it does a pretty good job. Naho's self-conscious naivete can be a bit annoying at times (especially when she keeps misunderstanding Kakeru's expressions of love despite already knowing that he likes her!), but she has enough going for her not to cross the line into being unlikable. And whatever her flaws, they're overshadowed by the interactions between the six friends. 
 The last thing I want to touch on is the pacing. I often complain that graphic novels move too fast - they race through plot beats without giving me enough time to really absorb the implications, or to get a sense of the characters by letting me see them to react to events. But Orange is a slow burn. Each event in the story is savoured, and the narrative meanders through the story at a leisurely pace. Characters have a chance to show me who they are, and their relationships have a chance to grow. It's really quite refreshing!