Female.
Author interview (11/15/2008):
http://liheliso.com/buzz/archive/00000616.htm
Baka-Updates Manga - KAWACHI Izumi :
Name (in native language) [Edit]
河内 和泉
Birth Place [Edit]
Osaka, Japan
Birth Date [Edit]
March 29
Zodiac
Aries
http://www.mangaupdates.com/authors.html?id=667