If you are looking for epic fanservice this 10/10. It is unfair to rate this like normal anime. It should be special category of rating things like that (other title Kiss x Sis Ova in this category). If we focus only on fanservice it is probably the best fanservice I have seen. Even if we compare to titles like Highschool dxd or Love ru Darkness ova. It is way better. In AVG ova they always make some situation by mistake to add fanservice and then suddenly end. Thats why most of the ovas have the same plot. TL;DR if you like fanservice thisis one of the best ovas. If you don't you can skip it.