The thing about this series is that it does not break any new ground whatsoever. The premise has potential, but the series never builds upon it, instead relying on tired tropes: dense/stupid main character (the brother), tsundere (the little sister), a childhood friend whose main features are her big breasts, a perverted best friend, an annoying ghost, a silent book-reading girl, etc., etc. It's all been done before. The aspect that could have been unique and set the series apart - the part about the ghost - is never fully explored. Instead, it's used simply as a device to make sure the "fanservice quota" for each episode is fulfilled. What results is a bland, tired, and frankly boring-to-watch incest fanservice show that is entirely forgettable.
Story: 5/10
The weak point of the series. All the plot points that get brought up along the way - why the ghost had to possess the sister, why the ghost loves the older brother, why the childhood friend came back and is hinted to be able to see the ghost, why the silent girl seems to know everything that's going on, etc. - are never really answered. This is second season baiting in its finest. Overall, nothing too interesting about the story.
Art: 6/10
The animation and character designs do their job. The characters look cute and appealing, the backgrounds are nice and detailed. It's not an action series, so there weren't any impressive feats either. The animation is simple but is sufficient in a fanservice show such as this.
One caveat, though: this is another one of those shows that censored its contents for the TV broadcast to bait gullible otaku into buying Blu-rays to see naughty bits, so keep that in mind. IF CENSORSHIP TURNS YOU OFF, THEN AVOID THIS SERIES ALTOGETHER unless you can get your hands on the Blu-ray version.
Sound: 7/10
The music is the high point of this series. The OP and ED are both very catchy and memorable, especially the ED, which coupled with the trippy/WTF/LOL animation makes for a pretty enjoyable closing segment to each episode. The sad thing is it was probably better than the actual show itself.
Character: 5/10
Like I said earlier, all of the characters follow archetypes and act according to tropes. Standard ecchi stuff: dense/clueless male MC protagonist, tsundere little sister who secretly likes her brother but abuses him because she doesn't accept that fact, the pervert best friend who wants to get into every girl's pants (even if they're a decade older), etc. Bland and forgettable characters that failed to leave an impression even after a fairly dramatic ending, especially since we were supposed to feel for the ghost near the end.
Enjoyment: 6/10
I'll admit the fanservice comedy got a few laughs out of me. Some episodes made me smile, mostly due to the characters' stupidity or the ludicrous plot. But mostly I watched this because I had time on my hands, but this show was not really something I looked forward to every week, in contrast to some of the other series that came out the same season.
Overall: 6/10
If you're looking for a mindless RomCom with incest undertones or an over-the-top and unnecessary fanservice series that allows you to turn off your brain and kill a few hours, then this series does fine. If you were hoping for a deeper story and good characters with fanservice only as cherry on top, then look elsewhere, because this is a completely standard, overdone ecchi anime that is a prime example of lazy fanservice-based series that seem to have burgeoned in numbers in recent years.
Other anime similar to this series:
NAKAIMO - My Little Sister is Among Them
OreImo
Listen to Me Girls, I Am Your Father!
Infinite Statos
Date a Live
High School DxD
Demon King Daimao
