Natsuyuki Redevous

This story follows Hazuki, who falls in love with the widowed flower shop manager.   When he gets to her house for the first time though, he runs into a half-naked man clinging to Rokka.  Hazuki thinks he is being told off in this fashion, only to find out later that the man is ghost of Rokka's first husband.  This anime is based off a 4 volume manga and was made with a total of 11 episodes.

*Slight Spoiler Alert!*
Now, after I finished watching the final episode, I noticed a good number of commentators felt that the series went down after Shimao (the late husband) took over Hazuki's body.  Personaly, I think the story wouldn't have gone very far with Shimao just annoying Hazuki at the flower shop and trying to ruin the relationship Hazuki was trying to grow with Rokka.

I wouldn't say this series is a must-see, but if you are in a mood for a more mature romance with some supernatural (ghost-wise) involved instead of those high school romance love, check it out.  =)

Here's the first episode on Hulu.  It is also available on Crunchyroll.