Something is Seriously Wrong in this School

One day Ayano kills Midori, the next day she's alive with no memory of ever getting killed. At first, Ayano thought that the worse thing she could stumble into is Kokona's bad life choices or finding another rival that wants Senpai but no. There just happens to be weird occult magic and insane science projects and secret government agencies that end up in Ayano's life as well.