Dead or Alive - 2 to 6 - Helena

Dead or Alive

Arcade release: November 26, 1996
Sega Saturn release: October 8, 1997 (JAP)
PlayStation release: March 12, 1998 (JAP); March 31, 1998 (NA); July 1998 (EU)

Dead or Alive 2

Original Arcade release: October 16, 1999 (JAP)
Millennium Arcade release: January 2000
Dreamcast release: February 29, 2000 (NA); July 14, 2000 (EU); September 28, 2000 (JAP)
PlayStation 2 release: March 30, 2000 (JAP); October 25, 2000 (NA); December 15, 2000 (EU)

Dead or Alive 3

Released: November 15, 2001 (NA); February 22, 2002 (JAP); March 14, 2002 (EU)

Dead or Alive 4

Released: December 29, 2005 (NA); December 29, 2005 (JAP); January 27, 2006 (EU)

Dead or Alive 5

PlayStation 3/Xbox 360 release: September 25, 2012 (NA); September 27, 2012 (JPN); September 28, 2012 (EUR)
PlayStation Vita release: March 19, 2013 (NA); March 20, 2013 (JPN); March 22, 2013 (EUR)

Dead or Alive 6

PlayStation 4/Xbox One/Microsoft Windows release: March 1st, 2019
Arcade release: July 18, 2019 (JPN)