Zongman, the history of a devil's rise

Traveling to the world of Demon High School, Vitan Asmodeus encounters the legendary magic book Radix Astyr.
Embark on a journey across dimensional worlds!
In the world of the clever girl, master the seventy-two demons, understand Sloth, and achieve the demon king body Berial.
In the dark world of bullets, judge the ignorant and selfish human beings, understand pride, and become the devil Lucifer.
In the world of Date Affair, master the Kabbalah Tree of Life, understand lust, and become the demon king Ashmedai
In the sword dance of the spirit master, he swallowed the world, understood gluttony, and became the demon king Beelzebub.
……
In the small garden, the great devil of the final trial of mankind, Vitan Asmodeus, looked at the beautiful girls in his community and couldn't help but remain silent!
Why do I have so many harems?