Just like the other guys review this is quite a bit watered down. But it still is following the Yosuga no Sora storyline which is pretty amazing. The manga is mainly focusing on the Sora arc as of chapter 6 and that's the reason why I am reading it. Because anime's based off harem eroge's will combine all the character's arcs which is really annoying at times when you've got your eyes set on that girl. It's short so give it a read.