Masashi Masamune, age 12, is yet another of Naota's classmates. He is friends with Naota and is often seen hanging out with Gaku, Ninamori, and Naota. Masashi also has a job as a delivery boy, and drives a truck around, even though he is only in grade school. His father's truck is later eaten by the terminal core when Mamimi loses control of it. Masashi, like Naota, generally sounds slightly depressed.