After Ch 17.6 (Official Translation)
THIS IS THE ONE YOU'RE LOOKING FOR!
This is always the one you're looking for. You're looking for that one where a girl reincarnates as a villainess and the OG villainess treated her brother/bodyguard so horribly and like made him kill his mom or something, and so she treats him way better this time and he's super protective of her? That's this one, baby!
Higeki no Genkyou tonaru Saikyou Gedou Rasubosu Joou wa Tami no Tame ni Tsukushimasu