Kono Naka ni Hitori, Imouto ga Iru!

An absolutely typical and practically devoid of originality harem, with average drawing and an unremarkable soundtrack, in a word - mediocrity. You can watch it, but there is practically nothing worth paying attention to or remembering in this anime.

It's not the most interesting harem, although a few boobs were poured out, and there were a lot of awkward situations, but the initial interest subsided very quickly. However, I still rated each episode 5 stars, so it's silly to complain in the end.
And yes - this particular special is the best episode of the entire anime. And it provides him with some kind of definite ending (although I'm sure that in the original manga the events go further and the conspiracy of the secretary and the actress is revealed in more detail)

@Kuroko: the most adequate tyanochka here (for all her inadequacy) is the president

Was I the only one hoping that he would stay with X?