"In 2040 Tokyo, Japan--Reito, a young man suffering from an incurable disease, vows to reunite with his childhood friend Erisa by entering "cold sleep" in hopes of curing himself. Five years later, the world has changed drastically. MK virus has wiped out 99.9% of Earth's men, leaving just five survivors and five billion women. Only five men, called "numbers," are immune to the virus. Reito is tasked with mating with the remaining five billion women for humanity's survival. In a post-pandemic world, harem life awaits him. Meanwhile, he becomes entangled in global conspiracy surrounding these numbers. Can he resist temptation and save the world?"
In the next episode, a catastrophic event leads to the near extinction of hum...