Mairimashita! Iruma-kun Vol.40 (Welcome to Demon School! Iruma-kun)

Volume 40 of Mairimashita! Iruma-kun (魔入りました! 入間くん), also known as Welcome to Demon School! Iruma-kun, a manga series written and illustrated by Osamu Nishi. It has been serialized in Shonen Champion magazine since March of 2017. 

This manga follows Iruma Suzuki, a boy who has been sold by his parents to a demon, who adopts him and takes him to his world. In this place, Iruma must go to the school of demons but he cannot reveal to anyone that he is the only human at the school.

Original version in Japanese. Contains furigana.