11eyes: Tsumi to Batsu to Aganai no Shoujo

A boy named Satsuki Kakeru, still grieving the loss of his sister five years prior, struggles to cope with daily life, supported by his childhood friend Minase Yuka and classmates. One day, the sky turns red and the moon black, causing everyone except Kakeru and Yuka to vanish, replaced by monsters. They flee and hide until the world returns to normal, but the event repeats. They discover four others connected to the phenomenon: a red-haired onmyouji swordswoman, a mute girl resembling Kakeru’s sister, a cheerful girl who becomes cold and violent without her glasses, and a boy with pyrokinetic abilities. Together, they attempt to survive as six shadows appear before them.