Erika is a former student of Keimon West Private High School.

The time is near future-Tokyo, Japan in 2040. Reito, a young man suffering from an intractable disease, vows to reunite with his childhood friend Erisa and decides to "cold sleep" to cure his illness. When he wakes up five years later, the world was undergoing a major transformation. The MK (Male Killer) virus kills 99.9% of men on the planet. The ground was a super harem with 5 billion women for every 5 men. 
 
(Source: Crunchyroll)
 
Note: The series was originally scheduled to release in the Fall 2021. Delayed last minute, episode 1 aired as scheduled on October 8, 2021 as a "special advanced broadcast" with the rest pushed back to Winter 2022.

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The Man-Killer Virus: a lethal disease that has eradicated 99.9% of the world’s male population. Mizuhara Reito has been in cryogenic sleep for the past five years, leaving behind Tachibana Erisa, the girl of his dreams. When Reito awakens from the deep freeze, he emerges into a sex-crazed new world where he himself is the planet’s most precious resource. Reito and four other male studs are given lives of luxury and one simple mission: repopulate the world by impregnating as many women as possible! All Reito wants, however, is to find his beloved Erisa who went missing three years ago. Can Reito resist temptation and find his one true love? 

(Source: Seven Seas Entertainment)
 
Note: The chapter count includes 2 extra chapters.