Yasashii Sekai no Tsukurikata

Yuu Tomonoga is a genius who was accepted to an American university at the young age of 13 and later accepted into the university's graduate program. Unfortunately, he loses funding for his research, but decides to drop out and continue the research on his own. He travels back to Japan in hopes of getting funding, but he quickly runs out of money for daily living. Luckily, he gets a call from an old friend and accepts his offer to teach at an all-girls school.

Includes bonus chapters:
Volume 1 - Extra
Volume 2 - 2x Extra
Volume 3 - Extra
Volume 4 - 4.5