Eroge by Selen, released 2004.

Shares characters with its sequel, [[shin ringetsu]].

Both Ringetsu and its sequel were made into OVAs.

h4.  See also

* Ringetsu on GameFAQs: http://www.gamefaqs.com/computer/doswin/home/921575.html

* Ringetsu's OVA on ANN: http://www.animenewsnetwork.com/encyclopedia/anime.php?id=7065
ringetsu