Versioning is a bitch in the AVN world. You see TheGame v0.1 and the title screen says it's the first chapter. Then you get version 0.2 and it says it's the second chapter. You think: “OK, I noticed a pattern, I don’t know what the first digit means, but the second one is exactly the chapter number. And suddenly the next released version is v0.21. What the... Is this chapter 21? Obviously it is not. Is this a fix for v0.2? But it contains new content after v0.2 ends.
Not that it matters much, but why use software versioning schemes for something like a TV series? It's common that the series consists of seasons. Each season, in turn, consists of a number of more or less equal episodes. If the episode has to be longer than usual, it's divided into two or three parts. And it's all. Leave those <major.minor.micro> to software products.