Mr. Tanaka teaches the class that Asa Mitaka attends at Fourth East High School. Outwardly a warm, caring instructor, he hides a compromising secret, and his life ends when Yoru, the War Devil, reshapes his body into a weapon mid-battle.
Tanaka stands tall, his black hair falling in parted bangs. His usual outfit pairs a white dress shirt and dark tie under a coat.
By most appearances he is a gentle teacher who cares about his students and respects life. He went out of his way to help Asa Mitaka fit in, nudging the class president toward friendship with her and even apologizing to the room on her behalf over the death of Bucky. That kindly image is complicated by a darker revelation, namely that he was carrying on a relationship with the class president, crossing both the age gap and the line between teacher and student.
Tanaka leads Asa Mitaka's homeroom at Fourth East High School during the period covering the Justice Devil arc. His warmth toward his students ultimately counts for little against the forces around him. In the course of Yoru's clash with the class president, the War Devil seizes him and converts his body into a living armament, killing him in the process. His presence lingers into the War Devil arc through later appearances.

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Mr. Tanaka is the teacher who leads the homeroom class that Asa Mitaka attends at Fourth East High School. He appears during the period covering the Justice Devil arc.
Behind his kindly image, Tanaka is revealed to be carrying on a relationship with the class president, crossing both the age gap and the line between teacher and student.
During Yoru's clash with the class president, the War Devil seizes Tanaka and converts his body into a living armament, killing him in the process.
Tanaka comes across as a gentle teacher who cares about his students, going out of his way to help Asa Mitaka fit in and even apologizing to the room on her behalf over the death of Bucky.
Tanaka teaches at Fourth East High School, where he leads Asa Mitaka's homeroom.
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