While the exact plot of Chapter 12 varies by translation pace, it typically follows the "monster-of-the-week" style harem expansion seen in earlier chapters (like saving the school beauty in Chapter 1 or encountering "Gyaru Darkness" in Chapter 8). Discussion threads on Reddit's r/manga often debate the absurdity of the series' "Darwinism" premise—where only those "adapted" to the virus can survive—and its overtly sexualized tone. Where to Read Let's Make a Harem in a Zombie World! Manga Review
Just let me know which of these would be useful to you. While the exact plot of Chapter 12 varies