'15 Bishoujo Hyouryuuki' is a hentai with a very believable story. 15 girls stranded on a desolate island with a single guy... and you know he's going to take advantage of that. Now how is that realistic? Well it turns out there is one realm where dreams come true and I've already said too much there.
That said, the plot isn't really that complex and switches from one girl to another rather quickly. So yes, the story is believable but at the same time shallow and lacking in substance. What 'Bishoujo Hyouryuuki' does have however is flawless comedy. This show has the knack of justifying any sexual scenario and enabling the MC to have sex with all the other characters through comedic means. And while some of them might have been predictable, most have actually caught me off guard. A prudent scientist character who doesn't really want to get involved in any inter-personal relationships? No way, right? Turns out she gets captured by a jelly monster and now the MC and her need to mix bodily fluids to defeat it. Yeah, I'll leave the rest to your imagination. This show is filled with such surprising and indeed, eyebrow raising moments.
The characters themselves are what you'd expect a character in most hentai to be like. Full focus on sex and that's about it. That said, the artwork compensates for the apparent shallowness. Designs are fantastic, animations are fluid and change constantly, i.e you won't see the same scene repeat for 5 minutes and see it reused in the subsequent episodes. Everything here is top-notch when it comes to animation.
The sound is something else entirely. This hentai features an opening and ending song. WHAT? First time I'm seeing that (and hearing it too). Even more surprisingly, it's quite catchy. Voice acting is indeed very good and the ambient sounds of waves, trees, sand etc. are all here. Superbly done.
All in all, a great mix of comedy & stunning artwork and sound. The story is believable but superficial, though what it lacks in depth it more than makes up for in sheer comedy value. Characters are shallow - that has to be said, however I wouldn't really expect anything else out of a hentai like this so they get a good rating nonetheless. There's simply not enough time to delve any deeper into their stories etc. and why would you. It's a hentai.
Not a masterpiece like "Hatsu Inu" where even the story was done flawlessly but definitively a good watch. Recommended to hentai connoisseurs and casual watchers alike.