I haven't seen very much hentai at all, but this title was recommended to me as being tentacle-free and actually having a plot (a combination which is harder to find in erotic anime than you'd think).
The story revolves around Master Gen, a Tenchi Muyo lookalike, who has gone to live with his grandma after the death of his mother. It isn't long before strange things start happening to him, but I won't spoil the surprises by saying more. The story unfolds at a regular pace with new information being revealed throughout. For an erotic anime, the plot is actually worthwhile, even if no opportunities are missed for 'interaction'.
One of the major drawcards for this OVA series was the quite 'artistic' nature of the production, with some very nice dream flashbacks in a red palette, an orchard of cherry blossoms, and music which added immensely to the enjoyment of this short series. The voice acting was also well done (in the Japanese at least), matching the character designs well.
I'd recommend this title to anyone interested in hentai, especially the curious beginner who isn't ready for tentacles and would perhaps like a bit of substance (it's not often you can say that you're watching hentai for the story). Fans of Tenchi Muyo might also get a kick out it.
