I Reincarnated as the Little Sister of a Death Game's Murder Mastermind and Failed
Ongoing | Inaida sou,Pepu | 2019 released
MC tried to be eccentric so her supposedly psychopath brother (ML) won't get bored of her and kill her. And it works, ML now cares about MC.
The Result of Being Reincarnated is Having a Master-Servant Relationship with the Yandere Love Interest