I really liked this manga because I really loved the art style. It started out very sweet, then got alittle deeper into the plot and became even more interesting. Then, it got quite creepy. I LOVE creepy mangas :D
My favorite character was Sekai. Makoto was interesting, but not quite an enjoyable character, while Kotonoha was kind of boring. The ending slightly confused me. I still think this manga was quite enjoyable, and you should read it when you have the time.
Thanks for reading this little review :3