Eroge by Selen, released 2004.
Shares characters with its sequel, Shin Ringetsu.
Both Ringetsu and its sequel were made into OVAs.
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
