It is rumored that Touji Seryou, one of the more popular boys at school, would 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 does go out with the first girl who asks him out on a Monday morning, the other side of the coin is - 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?

Hajime can't wait to make the scene at his high school...but his dreams of coolness are soon dashed by the appearance of the weird and wily Nagura! A third-year elite student with a serious thing for perfect ears, Nagura will stop at nothing 'til he's swabbed Hajime to his heart's content! How long can this pair of almost-friends keep their cat-and-mouse game going?