The first three chapter follows through with everyone's lives after they escape from the island. This is mainly about Ryo and Ango and how they (well mainly Ango) try to reconcile with the rest of the group. The last chapter is about Chimaki, a character so useless you wouldn't even care about and frankly nothing to review about. I would say overall they received a very realistic closure and the author also opened a doorway for a possible new series focus on just Ryo and Ango. They were my favorite characters. In my opinion Ango suffered too much and I think Ryo could have received awarmer closure. I also wished Koruri and Nijiko had a better closrue with Ryo and Ango, but what I got was a very cold-hearted response from them in this gaiden. I was also hoping Natsu turn out better, but I found the writing on her to be still very weak even in this gaiden.

But honestly you should read this yourself and give a better assessment.