Two short anime clips, produced by A-1 Pictures and serving as promotion for the manga.
 
(Source: Wikipedia)

An anime adaptation of the manga which centers around Junichirou, a young man obssesed with manga, anime and games. He was a young genius who published papers in the journals Nature and Science when he was only 17. However, after graduating college, he became a NEET (Not in Education, Employment, or Training) absorbed in his anime blog. Unable to watch Kagami throw away his life, his sister Suzune gets him to work at the Ichou Academy she attends. The head of the school's board, Koyomi Hiiragi, assigns Kagami to his new life as a teacher. 
 
(Source: Anime News Network)

Kagami Junichirou was known as a physics genius when he was a teenager, and he was even published in "Nature." However, after college, he suddenly lost all interest in science. As a NEET, he's devoted himself to his anime blog and nerdy collecting habits. He claims he has a serious illness called "I can't do anything I don't want to do." Desperate to get him to do something with his life, his little sister manages to get him a job teaching physics at his old high school. He's certainly an unconventional teacher, but he becomes fairly popular with the students. After helping a girl who's being ruthlessly bullied, Kagami finds that he actually likes teaching. Will he continue his career as a weird teacher? Will he go back into physics? Or will he end up back where he started? 
(Source: MangaHelpers)

Tags