The Principle of a Philosopher by Eternal Fool 'Asley' - Chapter 11.1, The Holy Warriors’ Vow

Kaito Nakamura, a shy university nerd, thought he’d found love when the stunning Aiko chose him as her boyfriend. Their sweet, fluffy romance fills his lonely world with hope—until he discovers she’s cheating on him with multiple guys, reveling in the taboo thrill of betraying someone so innocent. Heartbroken and humiliated as explicit photos of her circulate online, Kaito’s tears are interrupted by a mysterious popup: the “Revenge NTR System Beta.” Promising retribution but with a chilling condition — he can’t break up with her.Contains Ntr, read at your own risk

The one single goal in life of the Strongest Old Sage is to subjugate the Demon King. In an epic final battle, both of them met their mutual destruction at each other’s hands.

However, the Demon King was not completely destroyed!

In order to destroy the Demon King once and for all; post-death, the Old Sage trains in the World of Gods and reincarnates as the Apostle of the Gods, Will.

In the reincarnated future, the Old Sage had become a legend and his former disciples hold the supreme authority in the world. The disciples had created an organization to oppose the Demon King and an academy to nurture the new generation of Heroes.

Thus the Apostle of the Gods, Will (8 year old), enrols into that Academy of Heroes.

This is the story of a boy on a mission to save the world through epic battles while enjoying Academy life.

For twenty years since his soul had transmigrated, Bailuo thought this was an ordinary world, until one day, a black leather book appeared in his mind.“Is there magic in this world?”Facing Bailuo’s question, his uncle remained unwavering as he said, “No.”“But there are miracles.”“What are miracles?”“A sword that can release flames, a pot that can pour out gold, a beautiful girl grown from a fruit.”The uncle said, “Controlling the mist, bringing the storm, commanding the thunder.”“Magic!”Bailuo raised his hand and pointed, “This is definitely magic!”“No.”His uncle said, “These are truly miracles.”Years later, when Bailuo looked upon the nation he had built with his own hands, that magnificent and majestic sight, he agreed with what his uncle had said all those years ago, “This is a miracle…”

I returned after 10 years.