Аріма Ая

Kojirou's daughter and the youngest of the three siblings. Although she was a very sweet child who cared a lot about others, she was often the target of her father's wrath, as he considered her to be the most clumsy and irrational.

After her father forced her to go back to school late at night to pick up a notebook that she forgot to take home, she would fall victim to a serial killer, prompting the family to break apart and traumatize her oldest brother.