RegisterRegister!; レジスタ！; 收银台之星！; 收銀台之星！

How young is too young to fall in love? How old is too old to fall in love? Who decides the end of the flowery days of youth and the beginning of the same? In the eastern part of Tokyo, at a supermarket in a town zero meters above sea level. A chance encounter for two people over the cashier's counter. A youth-returning story where something might start!