Crest of the Stars (
Seikai no Monshou, Agh Dadr) is a Japanese
Sci-Fi novel, written by
Morioka Hiroyuki. The
novel was later adopted to an
anime series.
Crest of the Stars depicts an
interstellar empire ruled by various descendents of the
human race. Although Crest of the Stars builds a
well-established world (including a new
language and
writing system) and an
elaborate storyline about the war of the
different races, it is actually about the
unspoken love between
two teenagers of
different races.
The novel has so far not been translated, but you can get the anime with English subtitles.
Confusingly, the second part is called
Battleflag of the Stars (
Seikai no Senki).