The story begins on Sunday September 14, 1997 with two main characters shortly after graduating high school who are living together. They are, the protagonist and the heroine who he is living with; both characters' names can be altered to anything the player chooses. There are two parameters related to Masaki and Manami which change depending on decisions the player makes during gameplay. Masaki's parameters are physical and emotional strength, and Manami's parameters are degrees of affection and lewdness. How much money the protagonist has from his job is also a factor in the game; the player starts out with 100,000 yen.