Maki Kurimoto is a blue-haired, copper brown-eyed member of Kaori Saeki's academy occult club, sharing her friends' fascination with the supernatural. She possesses an athletic build and boyish features, often noted for her good physical condition, and plays tennis while wearing the academy uniform. In both the original game and first anime, Maki joins coven meetings in a rented apartment for unsuccessful magical rituals. When school nurse Reika Kitami and Taki Minase intrude, Maki defends Saeki but is overpowered by Kitami. A spell from Kitami induces intense arousal in Maki, leading to her sexual violation and subsequent transformation into Kitami's willing follower alongside Saeki and Jun Amatsuki. Under Kitami's control, Maki collects semen from male students and a teacher for occult purposes. She participates in a ritual where Saeki consumes this fluid to grow dual penises, resulting in a threesome with Maki and Jun. Maki also assists in tormenting Hiroko Takashiro and Kurumi Imari, restraining them during violations and joining orgies in the school basement to gather more semen. In the *Bible Black: Only* OVA (Volume 2), Maki collaborates with Saeki and Jun on their independent project to collect semen around the academy while Saeki still possesses the Bible Black book. The trio later uses the semen in a spell altering Saeki's anatomy, followed by a sexual encounter among them. These events align canonically with the main timeline. Maki's fate diverges: non-canonical game endings depict her remaining a servant of dark forces. In the true ending of the first anime and game, Hiroko Takashiro erases her recent memories to free her from Kitami's influence; she is briefly seen fleeing Kitami's final ritual. Her sexuality involves interactions with both male and female characters, potentially influenced by her corruption. Her personality is primarily defined by loyalty to Saeki and later Kitami, alongside compliance in the coven's activities.