Known for his quick determination of emotions towards others, freshman Touji Seryou can discern whether he loves someone in merely seven days. Despite his track record of dating girls who ask him out on Mondays only for things to end by Sunday, he always treats them sincerely. This, however, does little to deter potential dates from pursuing him.
Yuzuru Shino, a popular and attractive senior in the archery club, often gets dumped due to his disagreeable attitude. Upon discovering Seryou's reputation, Yuzuru jokingly asks him out as they randomly cross paths around the school entrance. Astonishingly, Seryou takes the request seriously. Will their weeklong relationship yield something extraordinary?
