Senzai Uchiumi is the oldest brother of Isamu Uchiumi(main character of Jealousy's Book) and is also the oldest son of Tamae and Akihito Uchiumi. Senzai is a soft-spoken kid, always obediently following his father's orders without a single complaint. Yet, his father constantly manages to find the single of mistakes and abuses the boy as a result. Though excelling in academics, Senzai is seen as the black sheep of the family, being called a 'disgrace' when he was accepted in an art university.