Sorry no picture But link here:
Denpa Kyoushi
here is a summary in spoilers
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?
IF you have read GTO (Great Teacher Onizuka) should find some similar lines to it
It even references to it in this page.
GTO reference
Anyway. Enjoy it.
PS! For "World only god knows" fans, you should see some Keima like passion to manga and anime.