A classmate in Yukiteru's school, Aru Akise dreams of one day becoming the world's greatest detective. The student detective is able to correctly deduce the culprit behind the serial dog murders even before the police. He is the main character in a spin off series (Mirai Nikki Paradox) where Murumuru accidentally destroyed Yuno from existence, meaning Yukiteru is still vulnerable from the Third. So until the damage is fixed, Aru collaborates with Murumuru and together, take the place of the First and Second.