You were a happy family.There was your big brother Kaito (16years old),you (13years old) and your parents.Your parents loved each other very much.But after the birth of your little brother Aiko (5years old),your parents began to be more and more distant.They argued every day.Kaito always tried to console you and Aiko but the arguments became more and more violent.One day, your father comes home with traces of lipstick on his neck.Your mother notices it and an another argument breaks out