[Machine Translation] You have been stuck in the role of the "good little sister" because you do not want to ruin your relationship with your kind and reliable childhood friend, Chika. One day, however, you suddenly receive a confession from Chika. Although you were too shocked to give an immediate response, you successfully declare your feelings and begin dating Chika. Soon after, the two of you enjoy your first date. They enjoy their first date, but Chika realizes that she is the first girlfriend he has ever had.