In the near future, the full-dive Virtual Reality technology will be commonly utilized in daily life. Mitsuki Kou is enlisted by his father, the developer of the new VRMMORPG “Destiny Unchain Online,” which features a skill system that prioritizes player abilities and Player versus Player over leveling, to test a revolutionary human interface device on the game’s release day. However, he inexplicably finds himself transformed into a vampire girl and trapped in the game with no means of logging out. Moreover, he ends up in a remote forest due to a malfunction. Despite being reassured by his father that he is not in any immediate danger, Kou decides to immerse himself in the game and make the most of his experience. He hones his skills, forms a guild, and inadvertently attracts attention by role-playing as a “Wizened Loli” character, captivating viewers with his streaming sessions. Soon, Kou becomes well-known as the “Scarlet Demon Lord,” Crim-Luersheia. But what impact will Kou’s prolonged exposure to the game have on his physical body in reality?