ouch :(
quick question though, why is Chisato x Ren a thing? They don't even interact much in the series?
I think Chisato was using Ren as a way to get her feelings for Kanon out.
No I meant in general, not this doujin specifically. The Chisato x Ren ship is pretty popular in pixiv, and I honestly don't know why.
I have my theories on why, but I personally like the Black and White color scheme they have.