Gakuen Abaddon -THE END IS NEAR-

You, Yamanobe Homura, have bid adieu your average life at Manakami Academy. Coinciding with a total solar eclipse, the school has malformed into a wriggling hellscape! Sure enough, having helped some survivors, you are given the option to join forces with your loved ones among them. Can you take back peace for this school from the wretched river spirits flooding through it all in one piece?! Who, between the people in this party of five you choose, will be the ones last standing?! Whatever happens will be all by your hands... [Translated from DLSite]