Ok, so, apart from the typical ecchi/harem stuff out there there are a few minor differances that I could see.
1: ALL of the harem, minus the little girl who really shouldn't be counted as part of the harem anyway, are ridiculously well endowed, with Tsukiumi having the largest. This is off of personal observation and opinion.
2: Minato actually does very little direct groping of the girls (incomparison to some I've seen anyway). So most of the ecchi content is rather, situational would be a good word.
3: There is a bit of disparity in screentime between the girls, mostly Musubi and... Ku. One of the producers must be a fan of loli.
In the grand scheme of things though I enjoyed myself. As well as laughing hard enough to cry on several occasions. The plot might be just a tad shallow, but I would say that the, content, makes up for it.