MADK

Makoto is referred to as a "deviant" because of his abnormal inclinations and has always suffered alone. One day, he half-heartedly used a "book for summoning a demon" and did a summoning ceremony, successfully summoning the Archduke of the Demon World, J, who has a majestic and beautiful appearance and could speak well. In exchange for his life, Makoto made a deal with J in order to make his hidden desires granted. Then, he was suddenly reborn as a demon?!

(Source: Pink Litchi Scanlations)