Hello!

I'm looking for a manga I heard about from a friend who I've since lost contact with. It was something she really wanted me to read. All I remember is that it was a horror manga and that the chapters had color-themed titles. I think she said that in one chapter, there were two children who were slowly freezing to death in a car and they kept hallucinating that there were monsters. I've tried googling variations of that plot, but nothing comes up.

Thank you!