Uda launched the series on the Gangan Online website in 2013, and Square Enix published the manga's 12th volume on March 22. Square Enix will release the 13th volume along with an official fanbook on September 12.
The manga inspired a 12-episode television anime series that premiered in April 2016. Sentai Filmworks has licensed the anime under the title Tanaka-kun is Always Listless, and it describes the story:
Tanaka-kun can't help it. Put him someplace nice and warm, and he'll start nodding off, even in class or on the way to school. You would think that this would eat into Tanaka's social life, but, fortunately, our consciousness-challenged protagonist has a guardian angel in the form of his best friend Ota, a gentle giant who (literally) carries Tanaka from place to place. Then there's class-rep Shiraishi, who's convinced that Tanaka's unique perspective lets him see past her beautiful appearance; Miyano, their hyper pint-sized classmate who somehow becomes Tanaka's unwanted apprentice in listlessness; and Echizen, a self-proclaimed delinquent who's determined to fight him. As for Tanaka, being the center of attention is the last place he wants to be, but the world just won't leave him alone in TANAKA-KUN IS ALWAYS LISTLESS.
Crunchyroll and The Anime Network both streamed the series as it aired. HIDIVE began streaming the show with an English dub in January 2018, and Sentai Filmworks released the series on DVD, Blu-ray Disc, and a premium edition Blu-ray Disc/DVD combo pack later in January 2018.
Source: Gangan Online