I just remembered that the mc (girl) met a boy when she was walking inside (a hallway I think) that boy is playing a piano, the boy has a friend and they both like to gamble (like bet on some horses), then this boy happen to lose his brother's important thing (I forgot what it was ). So, the mc told him what number would win—I also think the girl helped her for an exchange of a special egg, not sure. That's all I remember thankyou!
I just remembered that the mc (girl) met a boy when she was walking inside (a hallway I think) that boy is playing a piano, the boy has a friend and they both like to gamble (like bet on some horses), then this boy happen to lose his brother's important thing (I forgot what it was ). So, the mc told him what number would win—I also think the girl helped her for an exchange of a special egg, not sure. That's all I remember thankyou!