MTL - Rival In Business - Chapter 17 behave in a spoiled manner

In a world of endless star fields and interdimensional wars, the wizards' floating city conquered one world after another.At the wizard academy, through blood-stained exams, the towering wizard tower sent wizards batch after batch.Becoming an apprentice wizard, Richard activated the miracle furnace deep within his soul, where constant refining of materials granted him knowledge and skills...The veteran's weapon could be refined into legendary martial arts techniques.The ancient wizard's encrypted notes could be refined into lost knowledge.The remains of brutal monsters could be refined into monster bloodlines.In this era of great voyages in the wizarding world, Richard was destined to become a leader of his time.

Zero – Where the End BeginsAfter 100 lives—lived as a king, a warrior, a scholar, a knight, and even a slave—he has finally reached the last.Life number 0.No rebirth. No second chances. Only death… or glory.Thrown into the most ruthless and enigmatic world he has ever faced, he must defy its crushing grip, where power dictates fate and survival is a battle against the inevitable. His ambitions collide with the weight of his past, driving him toward a relentless pursuit of absolute control.In Zero, you either carve your destiny… or vanish into oblivion.

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 high school student that has lived as a mob-character ―― Mimori Touka