Responses
Hey! I know you know where it is but I'm gonna leave a link to The Circle/The Box underneath your comment for people who don't know where it is since it was merged with another story.
http://www.mangago.zone/read-manga/akuma_to_issho/
It was driving me nuts. I knew that I’ve read these characters before. It’s a sequel of The Box, which is a sequel of The Circle. They are chapters 1 & 2 of this manga. I’m so glad I found it.
http://www.mangago.zone/read-manga/akuma_to_issho/mh/v01/c002/