Doku no Ou Saikyou no Chikara ni Kakusei Shita Ore wa Bikitachi wo Shitagae, Hatsujou Haaremu no Aruji to Naru

Synopsis:

Thirteen years ago, the Kingdom of Jade was ravaged by a monstrous threat known as the "Poison Queen." A courageous band of adventurers succeeded in defeating her, but during the battle, one of them fell victim to a deadly curse. To survive, he had no choice but to pass it on to his son. From birth, Kaim Halsberg has been branded as the cursed child, despised by everyone except his late mother and Tii, the maid who cared for him. While his father and twin sister live in the family mansion, Kaim is forced to live alone in a secluded cabin deep in the forest. But everything changes when a mysterious doctor helps him break free of the curse and unlock his hidden power. Now reborn as the King of Poison, Kaim embarks on a journey to fulfill his deepest desire—though he never expected his poisonous abilities to have such strange and unexpected effects on the beautiful women he encounters along the way!