A boy who becomes interested in and joins Ishida's group of friends upon learning they are making a movie. He is eager to be the leading actor and is considered handsome and talented enough to do so. Mashiba was lonely as a child and the other children took him for granted and bullied him, now he is completely intolerant of bullies in any form, and while generally calm and level-headed, he reacts violently to any random act of bullying he sees.