Height: 183 cm Weight: 80 kg Birthday: 6th November Masato is a member of the Little Busters, and is Riki's roommate. He loves to work out and improve his muscle mass. His rival is Kengo Miyazawa, fellow member of the Little Busters.
In the artificial world, he supports Kyousuke's plan to strengthen both Riki and Rin to overcome the events in the real world. He saves Riki during the bus accident.