Hero Husband's Apocalypse Harem

Years after an apocalypse has ravaged the world, Sam is an ordinary man barely scraping by until a mysterious system appears and transforms his fortunes. To keep himself alive, he must find real courage when he is entrusted with protecting three striking women in a dangerous new world. Each of them ends up drawn to him in a different way, and Sam has to face what it truly means to stand up for others.