Though I see the errors in this story! Like the first one really pissed me off! TEN YEARS! And he was still a JERK. It's not necessarily and obsession as everyone says. Love can be like that! And believe it or not, shit like this happens. It's not all that unrealistic. The story with the model wasn't that unrealistic as well because people can be assholes and well communication is a bit lacking but yeah. The third couple was sad but not at all unrealistic, It's called being a rebound. And the fourth one! Ugh. We all the there are couples and people like that. So yes they are not modal couples but it's not unrealistic if anything it's plain said that these things do happen! Frankly, I can't say I enjoyed it completely but it was a great read! I especially enjoyed the one where they all meet!
Koakuma no Sanctuary