Disturbed Demon World is the one hundred-and-forty-sixth chapter of Osamu Nishi's Welcome to Demon School! Iruma-kun.
Summary[]
Sullivan meets with Bachiko and praises her for her training since Iruma was able to achieve Rank 4 under her guidance. Bachiko accepts the praise as Sullivan continues saying she is just as strong as the members of the Thirteen Crowns, but she humbly says the Thirteen Crowns are far superior compared to herself, the only exception being Paimon, whom she considers a bumpkin, even though Sullivan believes they get along.
Sullivan admits to Bachiko that because of her unsociable nature, he was unsure if she would accept his offer to tutor. Bachiko confesses she would have just gone home after meeting Iruma once, but now she considers him her best student. With their conversation done, Sullivan and Opera start cleaning up, but then Sullivan gets serious and activates an encrypted speech with Bachiko, which she kneels in response to listen. Sullivan informs Bachiko that the next Thirteen Crown's dinner has been postponed due to a number of increased cases of powerful demons going missing from various locations, such as Devilums and Battlefields. He says the cause is unknown, but he has a hunch that the ones responsible for this is Six Fingers. Bachiko believes he wants her to use her strength as a member of the Barbatos Family to fight back, only to be caught off guard when Sullivan says that is not the case. He says to her that when the Demon World is disturbed, that is when educators should focus on teaching the most, and to give students the best instruction to raise and protect them, the adults will bring peace back by properly guiding them. As such, Sullivan requests that Bachiko continue training Iruma, which she agrees too due to her admiration for his dignity. Sullivan then adds that Iruma is a human being; a statement that leaves Bachiko in shock.
Opera confirms this to Bachiko by revealing that the only people that knows (as far as they know) are Sullivan, themselves, and Shichiro. Sullivan pats Bachiko's head and says he will respect her will, offering to erase her memory of the conversation or working together to protect Iruma. Before Bachiko can answer, Iruma wakes up and greets everyone in the room, only to be surprised when he sees Bachiko. Bachiko watches Opera and Sullivan walk over to Iruma as she says to herself that knowing Iruma is a human sits weirdly right with her. She says that because he isn't a demon, it just means he's the only one who can be his student, especially considering how hard they trained together. Bachiko decides that, whether or not Iruma is human, she will keep an eye on him. She does, however, occasionally cause him to be her servant, which doesn't sit well with Sullivan and Opera.
Iruma goes back to his room wondering why Bachiko scolded him, and he looks at the Ring of Gluttony wondering how long Alikred will sleep. He gets up and grabs his winter uniform, saying that the next event is the Music Festival.