Seven Days: Monday-Thursday

Touji Seryou, who's extremely popular at school, has the odd habit of going out with whoever asks him first at the beginning of the week and then promptly dumping them by the end of the seven days. But on this particular Monday, the first person he meets at the school gate is no other than Yuzuru Shino, Seryou's sempai in the archery club. As a joke, Shino asks Seryou to go out with him - only to be surprised when Seryou actually takes him up on the offer!
Shino has no intention of actually being in a serious relationship with anyone, including Seryou. And it's not like it's actually love or anything. But is something different this time...?