If Ella had gone ahead and filed a complaint in heaven's court.
[From chapter 3]
"How about you disappear for some time?"
"Disappear!!"
"Yeah," says the demon lord, passing Ella an envelope.
(What is this envelope, hmm, this symbol is of an angel, wait, it's from HEAVEN.)
[Contents of the letter: As per the demon lord's wish, you are to reincarnate till your time comes to take the position of the next demon lord. If you have any opposition to this order, you may file an appeal in heaven's court.
P.S. Don't worry; even if you reincarnate, your position will remain the same, i.e. the next-in-line demon lord.]
"I want to file an appeal in heaven's court; I don't want to take the hassle of being born again. Like I finally decided to live peacefully, do you think changing one's personality is an easy thing. It's going to be a disaster if I were to be born again."
"Sure, why not?" said the demon lord, knowing this would happen.
[The next day in heaven's court, God is sitting at the judge's seat, the demon lord is discussing something with his lawyer- none other than his multi-talented butler, while Ella is standing in the witness box. God called upon the complainer's Ella's lawyer it was no one other than Flea- the boss demon.]
"Flea! You are my lawyer? you will fight for me," says Ella having a bright shine on her face for only a blink of a second because she thought (actually wait, do you even know how to be a lawyer, how do you plan to defend me, has the demon lord appointed you as my lawyer so that he could win the case easily, this is a conspiracy. There is a conspiracy going on in heaven's court in front of God, what have I done so great that I can't even get a lawyer who can defend me so I wish to say but Flea seems confident and I don't want to lose my one and only companion in this court.)
"I am sorry I am late for your honour," says Flea and then looking at Ella and giving her a thumbs up expressing not to worry anymore Flea to the rescue. [With that Ella was even more suspicious of Flea's skills]
"It's fine, I hope you are ready with the case," says the god.
"Yes, your honour," says Flea standing in his position near the witness box where Ella is standing.
"Then let us start with the hearing," says the god banging the hammer to add in his fun.
"My client Ella Boone does not wish to get reincarnate your honour as if she stays in hell she will be made the next demon lord as per the demands of the demons in hell but the demon lord does not want to lose his position and hence wants my client to reincarnate so that he can rule the hell without any obstacle," said Flea to God all in one breath to impress Ella and get her to be confident in him but instead all Flea received was poker-faced glare.
(Who the hell cares about being the demon lord I just want to live in peace)
"Objection your honour, my client is not as petty as the other lawyer just described. He is the current demon lord and he complies with his duties and responsibilities to keep the contract of peace between hell and heaven intact. He is simply afraid that Miss Ella might not be ready to take upon the duties of the demon lord and hence will affect the peace contract by starting the war" says the butler.
"Objection sustained," says God acknowledging the statement explained by the butler.
"Objection your honour, I believe that the demon lord has spoken that without any proof." argues Flea with a shine in his eyes thinking that he got a strike.
"Objection overruled, I believe that the demon lord has worked for quite some time and is famous for having an eye for people who are worthy for the job, he was first acknowledged by the previous demon lord and I have seen it for myself too." clarifies God.
"Then is war the only reason my client has to suffer for?" asks Flea to the demon lord who was also standing in the witness box opposite Ella.
"As Ella has decided to not be the fierce person as she was before and wish to have peace. I decided that she should get reincarnated as the wish she has is unattainable in hell and I do stand strong to my words. Also by getting reincarnated she would come to realise some aspects of life that she has till now ignored. And hence, when she achieves that I will be able to be happy to announce her to be the demon lord." answers the demon lord patiently.
[Thus, the case was closed ordering Ella to get reincarnated without any more objection.
CONCLUSION: Ella had to get reincarnated repeating the same scenarios as chapter 4.]