Orefuka is the newest game by Hulotte, a company infamous for making extremely ecchi charage with actual plot.  In this game, the protagonist, Haruki, is given pills that make him invisible by a net idol named Kusunoha Chitose, and he begins using it to stand in the same room while the heroines get naked, masturbate, etc without even a hint of hesitation.

Haruki is a young man who sees everything around him as an opportunity for fun, and he sees not having fun as a waste of time.  If he finds an idea or activity interesting, he will do it without hesitation, and he doesn't hide the fact that he wants to see all the heroines naked at all.  That said, he is not just an open pervert protagonist.  Rather, he uses his open perversion to hide a tendency toward quietly helping those around him, though he isn't always aware that is what he is doing.

The common path is an endless series of him sneaking in to see the heroines naked along with comical reactions, and SOL scenes full of heroines either going along with his 'nori' or acting in the tsukkomi position.  

Nayuri

Nayuri is the student council president, a brilliant young woman with an eidetic memory, as well as one of the heroines who goes along with the protagonist, constantly dropping hints that she doesn't have any problem with him going through with his openly-stated desires involving her.  Her route is... extremely ecchi.  There is serious drama in toward the end, but it is resolved in a classic manner that was so predictable I had to shrug and give a wry smile.  I did like that she turned out to be a total nympho and she wasn't kidding at all in the common route.

Ame

Ame is the protagonist's cousin who lives with him and her older sister.  She refers to him as 'nii-san' and is fairly obviously in love with him, even before a certain scene in the common route.  She is very serious and straight-laced on the surface, but under the surface is an endless lake of deredere brocon imouto jelly.  As the game's resident tsundere, quite naturally her dere is pretty ridiculously adorable.  However, the sheer amount of effort it takes to get to that point in her route is seriously ridiculous.  It doesn't help that her route is one of those 'sex before confession of love' routes.

Kohaku

On the surface, Kohaku is what is referred to as a 'cool beauty'.  She doesn't show her emotions, and she has a tendency to just quietly do what is required of her without complaint.  However, she is actually has the most common sense of all the heroines (including Ame, who is essentially a pool of molten dere inside whose common sense melts away when it comes to nii-san), and it shows in the way she gets together with Haruki.  Unlike the two paths above, it isn't a 'sex before confession' route, and it makes sense that way, seeing as she is the most 'distant' of the four heroines initially available (Chitose being locked).  The lack of intensive previously-existing intimacy (emotional or physical) means their relationship comes together in a more natural form.  

Kohaku's path after the romance is formed is a bit more of a 'kandou' (touching in a non-cathartic way) type, as opposed to the somewhat nakige (and nearly identical) drama at the end of the previous two paths.  Kohaku is also a lot more straight-up adorable than Ame and Nayuri from the beginning (Ame being a tsundere and Nayuri being a mischief-making oneesan type).  

Towa

Towa is what is called a 'gyaru' heroine, a heroine who dresses and does makeup in such a way that it is both flashy and fashionable (by Japanese standards).  One thing I should note about these heroines is that there is a huge gap between them in nukige and charage/moege.  Gyaru heroines in charage/moege are usually using their fashion-love to cover up a fragile but kind/sweet heart and/or some kind of trauma.  In nukige, they are usually nymphos who are selling their bodies on the side.  Keep in mind that this is one area where the two umbrella genres split rather dramatically.

Towa is a kind-hearted kouhai with a love of gaming who is very weak to peer pressure.  She is pretty obviously deredere over Haruki (like most of the heroines) from the beginning, but she isn't self-aware enough to realize it.  Her path stands out in the way it handles the plot device that played such a huge role in Nayuri and Ame's paths, as well as the 'different' approach it had.  Sorry I can't go into specifics without spoiling it, but this particular template was used in a very conventional fashion in Nayuri's and Ame's paths, whereas Towa's path gives it something of a twist.  Towa and Haruki's relationship is something of a traditional 'transition from good friends to lovers' path, albeit without quite as much in the way of relationship drama as such situations tend to bring up in charage that don't have a story to provide real drama.  Towa does have a personal issue that becomes central to the path in general, but it isn't quite as severe as Nayuri's or Ame's.  Overall, it was a good path, though not a godly one.

Chitose

Chitose is the game's true heroine and the provider (AKA drug dealer) who provides Haruki with the invisibility pills.  She is a virtual idol who attracts her followers through a mix of random daytime talk, cute mannerisms, and humorous interactions with them through paid comments.  Haruki is also one of her most devoted followers.  While she seems whimsical and easygoing on the surface, underneath lies an endless sea of desperate loneliness and self-denigration.  

That said, her path seems to be one of hope regained, despite the way it begins (incidentally, the scene where things start to tip toward romance is unbelievably rofl-worthy, hahaha), up until the point where you run into her underlying trauma...  though, needless to say, this trauma is resolved to an extent (as you would expect, since this isn't an utsuge) and she is 'saved' (truthfully, after playing this path, I wince to think of her fate in the ones besides Towa's).

Harem Scenes

This is basically an extra scenario where you can pick from a number of sub-heroine and threesome 'endings' that don't have any story.  It doesn't add anything but fap material and laughs, lol.

Conclusion

Overall, this is a decent game for someone who wants a charage with high ecchi and H content and a central storyline.  I'll probably forget this game fairly soon (charage are usually forgettable, even when they have stories), but I can still honestly say it is a good VN.  In particular, the way the protagonist uses the invisibility and gets used to staring at Ame naked regardless of the path (it becomes routine, which his funny in and of itself) makes me laugh.