Shuumatsu no Harem, known as World's End Harem, is a Japanese anime series that premiered in 2021. The story is set in a dystopian future where a mysterious virus has wiped out 99.9% of the male population. The remaining men, including the protagonist Reito, are tasked with repopulating the world. The series explores themes of survival and the socio-political implications of a world where women vastly outnumber men.