Oblivion's Throne - Chapter 6: The Six Forms

On a certain day, Ji Xiao Li led his newly-acquired disciple into a dungeon, feeding him all sorts of priceless red and blue potions.

Teammate: f*ck, tyrant, you have an ore mine at home?

Ji Xiao Li: how did you know my family owns an ore mine?

【Teacher Orders a Salute：disciple, enter the sect, accept my guidance. Tell teacher, what is the sect’s foremost teaching?】

【Milk Tea Small Crisp：Master, isn’t our sect just you and I, what is the foremost teaching?】

【Teacher Orders a Salute：evil, evil disciple! I said to say it so say it!】

【Milk Tea Small Crisp：……】

【Milk Tea Small Crisp：Beat to death YueJian Chunhe that son of a bitch!】

YueJian ChunHe = Milk Tea Small Crisp = Ruan Fenghe

Teacher Orders a Salute = Ji Xiao Li

- Description from Novelupdates

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

A black pearl brought Jiang Feng from a doomsday stage where top masters with one emperor, two emperors, three emperors, four deities, and seven peerless cities show off their glory to parallel time and space, and this time and space-the end of the world has not yet opened! !! Under the sky, the youth look up, if I have strength, can I get through … these two time and space! !!

- Description from 69shu

What if Midoriya Izuku stayed quirkless? What if he could become a hero without any powers? Or even more shocking—what if he became the successor to All For One?