Rihito Takarai Seven Days: Monday – Thursday

Seven Days is a two-volume yaoi manga written by Benio Tachibana and illustrated by Rihito Takarai. The first volume Monday – Thursday begins when popular boy Touji Seryou, who has a reputation for saying yes to anyone that asks him out on a Monday, runs into his senior in the archery club, Yuzuru Shino, at the school gates.
Aware of Seryou’s reputation, Shino asks him out assuming Seryou will think he’s joking, but true to form he accepts! There’s a catch though, Seryou generally breaks up with his new boyfriend at the end of the week. Can Shino be the one to change the game?