The World’s Most Terrible Mercenary Reincarnated as a High School Student with an Organ Transplant. ~The Story of Royal Consort~

In the web novel 'The World’s Most Terrible Mercenary Reincarnated as a High School Student with an Organ Transplant. ~The Story of Royal Consort~' (known as 'Sekai saikyō no yōhei ga zōki ishoku de kōkōsei ni tensei shita kudan. ~Ō hai monogatari~' in Japanese), readers are taken on a thrilling journey as a formidable mercenary's organs are transplanted into a Japanese high school student. The high schooler, previously brain-dead, undergoes a transformation with memories and skills from the mercenary's past life. This action-packed tale combines elements of adult themes, harem dynamics, historical settings, mature content, school life challenges, seinen storytelling, and tragic twists.