First, I reeeaaally love old shoujo manga. Especially the whole horror-romance thing in it.
They have their own charm, it works like a magic. I like it since I was 6.
About the plot, I quite like it.
About twins, similar to each other (psychically), and love towards the same person.
If this is a shoujo manga, it will be full of naivety, childish and melodrama.
Shinohara Chie is a veteran in this field and I think she did a good job.
Good to see she still active.