For You I Will Kill Everyone: Project Dia Horizon

For You I Will Kill Everyone: Project Dia Horizon manga summary: University student Shinji, who felt trapped in life because he couldn't make progress romantically or with finding a job, was given a chance to reincarnate. Moreover, he was given a "fated partner" to be with. He wondered if a happy life would begin, but then it began -- an eternal death game where he must kill constantly, only ending when he finally is killed him self.<br><br>"Don't worry, Big Sis will kill you."<br><br>Joining the murder spree with "Sister" Hilde, who shows an unusual affection towards him... The death game begins with a bond forged in blood!