I've read many books and not one book had ever had a lasting effect on me. It is as if there's a darkness that lies in all of us like a winter night with no stars in the sky, which makes us who we are and also takes a little part of us. This book takes a part of you with it in the end. You won't know what to do anymore.
The metaphorical conversation that k and sumire had with each other will want you to have someone to talk to. It will make you want to run and immediately find someone to hug and say all your dark secrets to.
This book gives you a realization, the kind of realization you have when you accidentally pour cold water on a chilly winter morning. A realization so deep that in the end you just clutch the book close to your heart and stare into nothing in particular but think how weird everything is and how nothing doesn't make sense anymore.