Reina Morimoto (Harumi Asai, credited as Haruka Fukai) is the main villainess of the hentai video game and anime series Discipline: Record of a Crusade. She is the older sister of Leona and reins over St. Arcadia academy as its principal and chairwoman.Reina first made an appearance on the day the vice Principal Kozo Machida decided to discipline her sister Leona by bringing the sadist teacher Eikichi Ogiwara to the school. Arriving to the school in a giant military tank, the evil Reina witnessing Eikichi slapping Leona and recognized him as her former personal slave back in the university, and had him be taken to her office to be punished. Later, Reina ordered Takuro Hayami, a student involved with Leona, and Kozo, to meet her at the Social Club room, where she revealed Eikichi's true submissive nature to Kozo who responded in distraught and anger. Leaving Kozo to be punished by Leona and Karen Himeki, the villainess took Takuro to her office and had her way with him after drugging him with an aphrodisiac, revealing the fact that she became a school principal because she likes young men like Takuro. After Takuro successfully satisfied her, the evil Reina let him safely leave her office.

In the bad ending paths, it was later revealed that Reina punished the students that failed in the exam "personally" as part of the Remedial Class of Hell, and also let Kaori Matsuno the homeroom teacher and the boys that got high mark in the exam did the same. Students that cheated on the exam were subject to human trafficking as sexual slaves, much to the Morimoto Family's profits. She does not tolerate low grades or cheating!