Noah faces off against an arrogant S-rank adventurer who attacks his monster companions under the assumption that all monsters are inherently evil.

In Chapter 7 of Isekai de Tadahitori no Mamono Tsukai ~ Tenshoku Shitara Maou ni Machigawaremashita , the story focuses on the fallout of —formerly a high-level hero—choosing the "Monster Tamer" class, which the world identifies as the "Demon Lord." Key Plot Developments

This chapter serves as a catalyst for Noah's reputation. After Noah easily overpowers the high-ranking adventurer, the loser spreads rumors that Noah is actually the "Demon Lord" to save face, leading to widespread misunderstanding.