Chounin A wa Akuyaku Reijou wo Doushitemo Sukuitai ~Dobu to Sora to Koori no Himegimi~ - Vol. 8 Ch. 40 - King Of The Skies

[master-34]

it flat out said in past chapter's that in the original timeline Ana got gangrape was told that all of her loved ones were killed for treason and then she was given the cursed sword to complete the corruption. She was not raped in the new timeline because she was protected, so the villains had to use a different way to break her before giving her the cursed sword

 

[Leeds_ultra]

Lol, it doesn't and I hoped the would no use dark magic or cursed objects here.

Like you said they did not need it.

Ana is called the dark corrupted last boss in the first chapter by Allen, and the manga creator did remove stuff that were in the web novel witch is why the corruption sword witch should of been shown in the first chapter was not seen until the flash back of the final battle of the game, dark magic has been around since the beginning