Kaidan Games High School [HQ]

There was once a Yandere named Ayame Koizumi. She had killed countless people in order to be with her lover. When she was captured for having been careless in one of her murders, she was sent away to the Mountains for all eternity until they saw fit. Which they never. She had given birth to her daughter, Akane Koizumi, who decided to turn the mountains into a school of despair. Each year, students are accepted to attend her privileged school. They don't know that they'll be sent to a Killing Game of Betrayal, however.