Doku no Ou: Saikyou no Chikara ni Kakusei Shita Ore wa Biki-tachi wo Shitagae, Hatsujou Harem no Aruji to NaruDoku no Ou: Saikyou no Chikara ni Kakusei Shita Ore wa Biki-tachi o Shitagae, Hatsujou Harem no Aruji to Naru; The Poison King: Now that I've Gained Ultimate Power, the Bewitching Beauties in My Harem Can't Get Enough of Me; 毒の王 最強の力に覚醒した俺は美姫たちを従え、発情ハーレムの主となる; El Rey del Veneno: al despertar el poder más fuerte, someto a las bellas doncellas y me convierto en el amo del harem en celo

Thirteen years ago, a terrible monster known as the Poison Queen attacked the Kingdom of Jade. A brave group of adventurers managed to defeat her, but in the process, one of them was struck by a deadly curse. To survive, he was forced to pass it on to his own son. Since birth, Kaim Halsberg has been despised as a cursed child, hated by everyone except his late mother and Tii, a maid who served his family. While his father and twin sister live in the family mansion, Kaim was forced to reside alone in a cabin deep in the forest. But everything changes when a certain doctor helps him overcome the curse and awaken his dormant power. Now reborn as the King of Poison, Kaim sets out on a journey to fulfill his one true wish though he never imagined his poison would have such a peculiar effect on the beautiful women he meets along the way!