Hayama is a company employee who loves reading the Tokyo Catalogue, a must-read for first-class men, and yearns to become a "first-class man". At a blind date, he meets Saegusa, who is the very embodiment of a "first-class man", and volunteers to become his apprentice. Although his aim should have been to become a 'first-class man', the more he learns about Saegusa, the more ......? 「会っちゃったんです、理想の、男に…！」　葉山は一流の男の必読書「東京カタログ」を愛読し、“一流の男”に憧れる会社員。合コンでまさに“一流の男”を体現する三枝と出会い、弟子入りを志願する。目指すのは“一流の男”だったはずなのに、三枝のことを知っていくたび……!?　一流の男×一流を目指す天然男子（※顔だけ一流）のアッパー・ラブ !!