Taki Minase is the protagonist of the original Bible Black series. It is Taki that rediscovers the Bible Black book.
While investigating a secret room in the basement of his school, Taki Minase discovers the Black Bible, a tome of ancient magic. He and his magic club begin casting love spells for students before Taki uses it himself. He initally targets Rika Shiraki, the student body president. The following day Rika sends Minase a note and she meets him and declares her love for him. The two adjourn to the gym where Rika gives Taki her virginity. Minase then seems to forget about her until she shows up the following evening at his home. She quickly throws herself at him and gives Minase her anal virginity as well. Just as Minase is about to ejaculate on her Imari appears and witness the sexual act. The following day Minase informs her that she is under a spell but she thinks that he doesn't love her any longer and throws herself off the roof.
After ensuring that Rika is ok, Minase returns to the basement only to be confronted by Miss Kitami. She explains what happened in the room 12 years ago and two make a pact where Minase promises to assist Kitami in exchange for the powers of a lesser demon. Minase uses his powers first on his sister, Yukiko. He eventually is snaped out of it by Imari before she is captured by Miss Kitami's slaves. Minase manages to save Miss Takashiro and the two search for a way to stop the ritual. Minase tries to go save Imari but he is forced to have anal sex with Imari before he is removed from the site and treated with death. Miss Takashrio however has discovered the means to stop the ritual and save Imari. While they begin to prepare for the ritual Minase and Miss Takashrio have sex as the teacher has been injected with drugs that require her to have sex quite often. Their second session is witnessed by Rika, who is still under Taki's initial love spell.
Minase eventually is approached by Rika who stabs him in the chest for having sex with other women and throwing her to the art class orgy. Rika begins to have sex with him as he bleeds out. Minase is saved by the timely arrival of Miss Takashiro. While Rika is recovering at Minase's home she and Taki's sister, Yukiko Minase arrives and the two women are sexually assaulted by enslaved students. Minase knows that he must ignore this sight to save Imari and the ritual is haltd. After Miss Kitami is stopped Miss Takashiro erases the memory of everyone save Taki and Imari. Some time later Minase and Imari become a couple and the two truly consummate their love for one another.
Minase was not featured in Bible Black II. He is mentioned by Imari who was being influenced by Miss Kitami. At some point in time it was implied by Imari that Miss Takashiro tried to use her feminine wiles to steal Minase from her. Nothing more has been said about Minase.