"Since that day, my love has kept directing to you..."In a certain autumn day, the two was tightly bonded under the sunset...Half of a year has passed; Yui and Sakurai are now studying for the university entrance examination. Sakurai, who once got the lowest grade in school, recently shows drastic improvement.This time Yui is challenged to a duel instead. At first she was unwilling but finally she accepts his challenge, as it relates to their studies.The loser must obey the winner... This battle is about to explode...!!