Shounen. Shoujo. Seinen. Josei. These are the typical demographics that are used in Japanese manga to gear the intended target audience of any given magazine. However, no projects are to be treated explicitly for boys, girls, men, or women; and having a demographic label is pretty arbitrary, albeit a pretty good indicator.
Having said that, this TV series became AT-X viewers’ Anime of the Year 2014, which is one of the premiere polls of what is most popular in Japan: the intended anime audience (not saying, of course, that input from non-Japanese audiences are not important; but it is what it is). And I think part of why it gained so much popularity is because this show, which was adapted from a 4-panel shounen manga publication, appealed to audiences from all the “typical” demographics.
But enough of me rambling on about the complexities of sex identities (I’ve been reading a lot of Simone de Beauvoir lately). This series was one of my favorites from last year too; and as strange as it sounds, my first exposure to it was not from the manga, Crunchyroll, or even a close friend. I first heard of Monthly Girls’ Nozaki-kun from a Chiyo cosplayer at Anime Expo 2014 (right about the time the series aired), who just happened to also be an alum of a school that Latino Gamer and I attended!