I wanted to read Nadeko Snake because I felt the story in the anime was a bit poor. I read Tsubasa Cat to see if the story was better explained. Between subs not always correct and the many text flashes, reading the original text made things more clear for me.
I think the date chapter as a whole is probably the best thing Nisio ever written, and certainly the most romantic. But damn, Hanekawa getting NTRed was really heartwrenching