Kyou, Eki de Mita Kawaii Onnanoko.

Kameyama, a middle-aged man, can't help but notice what the pretty girl he sees at the train station is wearing. That Milbon scent is loved by all of mankind! This glittering case is from Sebon Star! That glowing skin... isn't a treatment, just a highlight! Which brand's cosmetics wear off, and which ones last? "I wanna know all about it!" he thinks to himself. Many of those "young lady things" he's become obsessed with now, appear before him!

(Source: Flex Comix, translated)