WorldEnd: What Do You Do at the End of the World? Are You Busy? Will You Save Us?

Humans have gone extinct upon the appearance of mysterious 'Beasts', while the surviving races live on floating islands in the sky. Only a small group of young girls, Leprechauns, can wield ancient weapons needed to kill the creatures. Their lives are short and violent. A young man, the last living human awakened from a frozen sleep, becomes their father-figure, caring for them even as he struggles to come to terms with his new life.