Matei Kyoushi to Juuzoku Shoujo no Haitoku Keiyaku

Story:

Joseph, the successor of the Great Demon Emperor, He becomes a teacher at the Magician Academy with the help of the demon daughter Lilith who has the power of "love" which helps him to succeed in ascending the throne. But it's not so simple. In order to ascend to the throne, he will have to form "love connections" with beautiful female subscribers!?