Destiny Unchain Online: Kyuuketsuki Shoujo to Natte, Yagate "Aka no Maou" to Yobareru You ni Narimashita

A skilled gamer known as Crim the Headhunter begins testing a new game and its accompanying device created by his father. During the process, a malfunction alters his appearance, transforming him into a vampire girl. As he navigates this unexpected change, he forms connections with others and engages in the game's challenges. The experience leads to a journey filled with gaming adventures.