Intriguing plot, maybe... (*≧▽≦) A fresh take on modern reincarnation storys due to the sense of twistedness and danger it provoked, but unfortunately the ending wasn't that strong.
In the beginning, the brother is lifeless like robot but after the incident, he slowly turns into yandere for Mai. I love his internal monologue which goes like, "If you didn't want Mai's life, give it to me. I will treasure her."
The sister (mai) is not normal either. I mean, she know her brother is going to be a mu*derer and the first thing she do is trying to make life fun for him ( ・◇・)？Honestly, even after she remembered the past life, she is still a brocon without realizing it!?
A waisted emotional investment il||li(つд-｡)il||li
I Reincarnated as the Little Sister of a Death Game's Murder Mastermind and Failed