 The game was released on April 6, 2006 and is developed and published by Konami.Professional Baseball Spirits 4 (プロ野球スピリッツ4, "Pro Yakyū Spirits 4") is a baseball video game published by Konami for the PlayStation 2 and PlayStation 3 in Japan on May 1, 2007.It is the sequel of "Pro Yakyū Spirits 3".