It is rumored that Touji Seryou, one of the most popular boys at school, will go out with anyone who asks him out on a Monday morning... But on this particular Monday morning, the first person he meets at the school gate is no other than Yuzuru Shino, Seryou's sempai at the archery club... On a whim, and well-aware of Seryou's reputation, Shino asks Seryou to go out with him... Thinking that it will be treated as a joke, (they're both guys after all) imagine Shino's surprise when Seryou takes him up on the offer! There is a catch, though... While Seryou will go out with the first person who asks him out on a Monday morning, the other side of the coin is that by the end of the week, he will break up with that person... In essence, Seryou is a lover with a one-week expiration date... but will Shino prove to be the exception to that rule?