kenja no mago
Kenja no Mago (賢者の孫, The Philosopher's Grandson) is a light novel series written by Yoshioka Tsuyoshi (吉岡 剛) and illustrated by Kikuchi Seiji.
It is being published online to 小説家になろう ("Let's Become Novelists"), with the first piece of it being posted on January 2, 2015. It eventually reached 4th place on the site.
The first printed book was published by Famitsu Bunko on July 30, 2015. The book was titled Kenja no Mago Joshiki Yaburi no Shinnyusei (賢者の孫 常識破りの新入生, The Philosopher's Grandson: The Common Sense-Breaking Freshman).