DxD: Building A Demon Clan From Scratch. - Chapter 42: Yeah For Learning Purposes (BONUS)

Nine heavens and nine earths, there are many souls.

The strong stand in the nine heavens, like shining stars, while the weak creep on the ground like tiny ants.

The young boy Bai Ye accidentally unlocked the mysterious heavenly soul, cultivated supreme soul skills, guarded the soul and sword, rushed into the nine heavens and swept the stars, and the legend began…

- Description from MTL

Seven years ago, after their breakup, he disappeared without a trace.

Living things really are ignorant – the greed to obtain the key to knowledge and the fundamentals of energy overpowers them. Little do they know that knowledge is full of lies and energy is the root of destruction. Us, mages, have mastered travelling through space and time. We are invincible, we can turn worlds into dust and you, mere ants, will be wiped out with no trace.

-Mage Adam

An A.I.(Artificial Intelligence) gets reincarnated into a world where he becomes a mage.

Haruma Kazuki is a cursed (or maybe just deeply unfortunate) high school student whose lewd, panicked, or absurd thoughts literally manifest in reality — especially when he tries not to think about them. The more he denies or avoids feelings, the more chaotic and trope-heavy the consequences.