So good! This is probably my favorite short manga of all time. This manga explores human greed in such a interesting manner; that greed is a way to escape reality. The Snake's book, which is a lesser version of Alice, is filled to the brim with people who are enjoying their desires to the fullest. These desires are often a response to the unhappy manner of their lives. We have a NEET who wanted to be a hero, a father who wants the perfect family, an termiannly ill woman who wants to be healthy and pretty, and my favorite, the bullied boy who exacts his revenge on all who hurt him. Even though these people are living their desires, their perfect rooms cannot let them live a perfect life. The longer Alice sticks around, the more we see cracks in the rooms; the lies that they live cannot last because they know that they are lies. This desire for something more, restriction of the truth, and isolation from the world (aka other rooms), ties into Alice. Alice, while alive, was trapped to her bed - the way that the others are trapped in their rooms. Alice's life was also very unhappy; but unlike them, she sought the truth and decided to do something in her real world that she wanted, instead of relying on her desires in an artifical manner. Where it gets really cool is that her book, which contained the raw information of the world, granted her deep desire - for more. Alice is the bad guy, and her greed has won her the world. Even though she did the "right" thing, by deciding to embrace her life, and make changes to the real world instead of relying on fantasies, the manga throws a curve ball because her desire was greedy at it's core, like all of the other rooms. Alice ate the world in order to live her desire - the one thing that made her happy. She states over and over that she hates lies, loves the truth, etc, etc. Isn't Alice lying to herself? She loved how big the world was, and the truths that it had, but she ate everything that she could and destroyed the world she loved so much. We can see that at the end. Alice finds her younger brother, beats him, and once again, is left alone in the world. There will be no more books, no more truths for her to find.
Alice did the same thing as the people inside the book - she let her desires consume her in response to her unhappy life. Unlike them, she had the power to not be eaten by something else, and could enact her will in the real world. But to jump back before the snake opened, and after her defeat, we can see that the greed plays a role in society as well. Alice's power caused humans to desire it, and led to wars and the creation of lesser books of truth. The work is caused by Alice's greed, and ends with the remains of it.
How cool!