Ok, according to info, this OVA is taken from ninth special-edition volume of its manga, and I just gonna cut to the chase and just present my ratings for this OVA:
Story and art: Mediocre 5.
Because it was still the usual plot where there is no plot and everything rides on the male character, Kazama, so therefore there is nothing more to say on something when it was pretty obvious that it was the usual, same thing with the art since the one who did the illustration of both the manga and parent anime is the same one who did it anyways.
Sound: Poor 3.
Now I may
like the opening theme, but Kazama'z seiyuu, Konishi, Katsuyuki was really too old to do the voice of a 17 year old, in fact one can really tell that Kazama's voice is really done by a 40 year old man, Studio FUNimations should have taken the effort to choose a younger individual to do Kazama's voice. Also, Sakura's voice should have been done by Toyosaki, Aki, co'z, the character's seiyuu Takahashi, Mikako doesn't have that playful tone that would fit the characters personality. Roka's voice is ok, but Chitose's voice isn't , her voice should've have been done by Ueda, Kana, and not by Saito Chiwa.
Character, Enjoyment and Overall: Good 7.
Unlike the parent anime where it involves the guy and the girls' antics, this time the focus was about the guy's sister, Noe and the water girl Sakura, of course the main character Kazama was still there, the threesome has given this OVA a whole new lease at least just for this OVA, which is good, since the threesomes' did provide a much change of enjoyment for this anime, especially when the competition for the guy's affection was with Nao vs Sakura, so overall it was good that we get to see Nao having her shine in this OVA.
So should this OVA be followed up by a season 2, maybe, but, why not?
After watching the 12 episodes, the OVA makes a break from the usual antics of the gang and refocuses the attention on Kazama's sister. This actually makes for a nice change, as we see the characters outside of the school environment getting up to yet more crazy stuff.
I know that some argue that D-frag lacks a clear direction from episode to episode, however I can think of one or two shows where the stories are self contained within each episode. I found this OVA to be a lot of fun and if your a fan of the series, then definitely watch it.
The only criticism I
do have is regarding the voices, sometimes the voice actors sounded a little too mature for the characters they were voicing. But as I'm reading the subtitles and not paying much attention to the voices, it really didn't detract from the episode.