Reapers. They exist. The only people who see them are the dying. The reapers have exactly seven days to spend with the target, making their last days memorable. On the seventh day they reap their souls.
A reaper comes to Earth to reap the soul of a girl. He spends the appointed time with her, but finds himself thinking about her when he is not with her. He starts to develop human feelings, which is unheard of.
He has to prepare the girl for her day of reaping, but will he be able to let her go when the time comes?