MTL - Mommy Stuns The World After Her Divorce - Chapter 8 Tsk, the truth back then turned out to be like this?

This book was also called “I’m Really An Upright Man”. I am Qin Shujian. I’ve achieved nothing in both the way of the book and the sword in these prosperous 30 years. This is the growth journey of an honorable, compassionate, and upright man!

Sing the story, bard, of the Firebrand. He, the youth who saved Morcaster from ruin. He, the warrior who defeated an empire. He, the archmage who crossed the Netherworld...The tale of Martel the mage, from his humble beginnings as a hapless novice at a magic school. Slow, character-focused and light-hearted progression fantasy. Updates daily.

This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.