Even though this manga is not completed yet, I'd like to review on what I've read so far (up to chapter 36).

Art

While the art is very simple, it works and is kind of cute in its own way. The art isn't ugly, just plain. It has its own charm to it.

Characters

The characters are very well done. I feel very emotionally attached to the two main characters and even the side characters are very realistically portrayed.

Story

I thought this was going to be something light and fluffy like Yamada-kun and the Seven Witches, with the body swapping. It would have even been alright if it was as serious as Kokoro Connect with its body swapping parts. But no, this manga is not like any body swapping scenario I've seen before. It truly reflects the title, bitter change, because as I read it I feel nothing but bitterness.

While nothing sad is particularly happening, no one is dying, no one is getting injured, no one is being abused or betrayed, and all of the characters are usually smiling, I can't help but choke up and cry while I read this. I'll come across a scene where the characters are just standing around talking and suddenly I'll be holding back tears. While nothing horrible is happening, this is a very sad situation in my opinion.

The two main characters, at about the age of 10, swap bodies. Immediately I assumed how the story would go from there. They'd learn about each other's lives and solve each other's problems and eventually return to their own bodies and maybe even fall in love. But this turns into something completely different. These poor children, so far, spend 1/3 of their lives in the body of the other.

I keep thinking, why, why, why do they have to suffer through this? It would be one thing if they simply swapped genders, but why bodies? The idea may seem entertaining at first, but I feel like these poor kids are being tortured. This is a much more serious manga than you'd expect it to be. It causes me so much pain that I hesitate to give it a ten, but since the manga can even make me feel pain it means that it deserves that ten.

Overall

This is a good manga but if you think as much as I do, this is not for the weak of mind and heart. It really makes you feel for the two main characters.