Green Angel

(from ebookjapan):

This early masterpiece is a lyrical depiction of the downfall of a nation in Atlantis and the tragedy surrounding the love affair between fairies and humans in medieval Europe.

A must-see for fans of Matsumoto's later works, in which various elements that would color his later works appear in abundance.

The e-book version does not include the "Green Angel" reader (a separate appendix).