In Episode 4 of "Akuyaku Reijou Level 99," Yumiella Dolkness is suddenly accused of being the Demon Lord because she uses black magic and has black hair. This misunderstanding is fueled by Alicia's speculations, which are stoked by a leaked secret from Prince Edwin about the anticipated return of the Demon Lord.

Amid the unfolding drama, the introduction of the new school director Ronald adds another layer to the narrative. His conversations with Yumiella about the kingdom's strategies and the secrets surrounding the Demon Lord's return hint at a broader context of preparations and intrigues within the royal family and the academy. Ronald asks Yumiella to assist with administrative tasks while the field courses take place.

The episode ends with a dynamic field lesson showcasing Yumiella's unconventional yet effective teaching methods. Her use of a monster-summoning flute to enhance the training exercise leads—despite initial panic—to a successful demonstration of teamwork and strategy among the students.