Yotsunoha (よつのは, lit. Four-leaf clover) is a Japanese visual novel developed by Haikuo Soft, and was originally released as an erotic game on January 27, 2006 for the PC as a limited edition containing a set of three CD-ROMs in Japan, followed by the regular edition, released on September 1, 2006 as a DVD for the PC. A PlayStation 2 version titled Yotsunoha: A Journey of Sincerity, published by Gadget Soft with adult content removed, was also released on August 28, 2008. The story in Yotsunoha focuses on the appeal of the four female main characters. The gameplay follows a linear plot line, which offers pre-determined scenarios and courses of interaction.