That big warning has me on edge the entire chapter. Does it explicitly said in LN? Otherwise, it just seems out of place. Like "HEY WARNING THIS CHARACTER IS RAPED! IF YOURE EASILY TRIGGERED BY FICTIONAL CHARACTER BEING RAPED, WHICH THIS GIRL HAS BEEN, GANG RAPED TO BE SPECIFIC, YOU SHOULD TURN AWAY NOW BECAUSE THEY ARE TALKING ABOUT GIRL BEING RAPE IN THIS MANGA"