is a Japanese
light novel series by
Ichiro Sakaki and illustrated by Yukinobu Azumi, also known as the popular adult
dojin artist Nakayohi Mogudan. In 2003, it was adapted into an
anime series produced by
Bones. The character designs in the anime are by Takahiro Komori, who is also known for the designs on another anime series,
Cowboy Bebop.