Natsuyuki Rendezvous is about when to move on and regrets after death and interestingly enough this isn't just about the living but also the dead.
The story begins with Hazuki who has a crush on Rokka the widowed owner of a flower shop who is 10 years older than him. For unknown reasons he is unable to work but when a part-time opening is advertised at Rokka's shop Hazuki jumps a the chance mainly so he can get to know Rokka better. Just when he begins to make progress with Rokka, Hazuki meets Shimao the ghost of Rokka's dead husband who has no intention of allowing any man near Rokka.
The story begins well but loses itself just over half way through. Natsuyuki Rendezvous has good characters beautiful and colourful art work and music which fits the anime just right i feel the story tries to do too much and over complicated itself.
However, what makes Natsuyuki Rendezvous a success are the interactions of the characters. There is the rivalry of Hazuki and Shimao, the overcoming of guilt of having feelings for another man other than her husband and her reluctance to move on from Shimao's death, Hazuki's often bad decisions while trying to woe Rokka and Shimao's regret of being more open with his feelings with Rokka when he was alive. It is these interactions which keep you watching.
Natsuyuki Rendezvous is a very good anime which perhaps at times is sad and at times uplifting but could have been better if the story tried to do less than it did.