This is one of those shows that you know is going to be horrible right from the premise. An extremely generic and oblivious guy, Yuuya, gets a new sister, Mitsuki, after his father remarries. Mitsuki soon runs into a ghost, Hiyori, who has amnesia and can only remember that she loves Yuuya. In order for Hiyori to go to heaven, she has to get Mitsuki and Yuuya to fall in love (or at least have Mitsuki get turned on by him enough times to fill up the "special" meter in the chastity belt). I have no idea what bizarre religion only lets spirits into heaven after making step-siblings fall in love... To top it all off, Mitsuki can only "open" up the chastity belt for three minutes at a time every hour. Hiyori's final goal is for Mitsuki and Yuuya to have sex so that she can go to heaven..... considering the chastity belt only opens for three minutes, they better make it fast. So the premise is absolutely stupid and I only watched it for the laughs. The plot is actually hilariously bad at times, but most times it'll just leave you shaking your head at how dumb everything is.
Speaking of dumb, the characters are horrible and stupid on top of that. Yuuya is oblivious to everything, Mitsuki is your generic tsundere, and Hiyori just causes trouble every episode. The minor characters are completely forgettable and only help to cause friction between Mitsuki and Yuuya and be even more generic than the main characters. There's not much to say about the characters other than that.
Well, except that the character designs are also terrible. The area in between the characters' foreheads and cheekbones is depressed so much it just looks strange, kind of like if they all slept with their heads on their hands when they were babies and caused a permanent skull deformation around their eyes. The backgrounds and the rest of the characters are cheaply designed, but the worst part is when it comes to the fanservice.
There are two things that are both problematic with this:
1. The censorship is over-the-top as I already mentioned (and it's not just bright light covering things, it's a giant lock).
2. Those weird eroge-style text boxes whenever Hiyori sexually assaults Mitsuki off-screen. That is the worst part of the show. It seems like they just decided to throw in a little yuri fanservice, but then told the audience to just imagine it themselves like they were reading a book and not watching a show.
The soundtrack is also boring and forgettable, and the opening and ending are typical j-pop songs for an ecchi show.
My recommendation is to not watch this show. The characters are generic and helpless, the animation is just bad especially for the character designs and fanservice, I have no idea why anyone would come up with such a bizarre story that defies any existing religious belief to create it's own stupid one, and it's really only enjoyable if you're going in expecting to laugh at it or if you really, really enjoy ecchi shows for the fanservice alone.
