Rumor has it that Touji Seryou, the school's heartthrob, will date anyone who asks him out on a Monday morning. When Yuzuru Shino, Seryou's senior in the archery club, becomes the first person to encounter him that day, he decides to take a chance and requests a date. Expecting a joke due to their gender, Shino is shocked when Seryou agrees. However, there's a twist to Seryou's dating rule – he ends relationships by the week's end. Can Shino defy this pattern and become Seryou's lasting exception?