The manga from Kodansha's Dessert magazine, Tonari no Kaibutsu-kun ("Monster-kun Seated Next to You") was announced as an anime back in May, but just recently the details of when the anime begins has was announced on the anime's official website.
The series will be airing on TV Tokyo its allied networks throughout Japan on October 1st. It will start in a late-night slot at 1:35 AM that Monday. The allied networks in other regions may have different start times.
You can see details and character designs in a recent Crunchyroll news article.
Are you waiting for Kaibutsu-kun?
©Robico, Kodansha/"Tonari no Kaibutsu-kun" Production Committee