Genres: action, fantasy, romance
Themes: harem, moe

Synopsis: After losing his sister five years ago, Satsuki Kakeru led a vacant life, only able to return to his normal days with help from his childhood friend Minase Yuka and other mga kaibigan at school.

Suddenly one day, the sky turns red and the moon turns black. Everyone besides Kakeru and Yuka disappears and monsters start roaming the streets. All that they were able to do was just to run away and hide. After a while, the world returns to normal. But just when they thought everything was a dream, the Red Night occurs again. Kakeru and Yuka manage...