* You didn't get lucky with model management (more on this below). * You didn't guess a girl's free day correctly / Ryuuji is pestering her. * Less than 3 Knowledge (on average) from surfing the Web. * Less than 50 Strength from training twice a day.
As a general rule, RESET the game each time you get one of the following: It is located at the Mystic Shop » Starlight of Hope.